Annual report [Section 13 and 15(d), not S-K Item 405]

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Fair Value of Plan Assets (Details)

v3.25.4
PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category $ 4,346 $ 4,237 $ 4,282
OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 763 742 739
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 2,083 1,941  
Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 409 450  
Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 526 577  
Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 97 124  
Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 619 692 $ 770
Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 15 19  
Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 1,118 1,027  
Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 242 149  
U.S. equities | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 861 816  
U.S. equities | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 108 99  
U.S. equities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 861 816  
U.S. equities | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 108 99  
U.S. equities | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. equities | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. equities | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. equities | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. equities | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. equities | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Global equities | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 640 570  
Global equities | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 36 31  
Global equities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 555 501  
Global equities | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 3 3  
Global equities | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Global equities | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Global equities | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Global equities | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Global equities | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 85 69  
Global equities | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 33 28  
U.S. government securities | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 779 755  
U.S. government securities | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 236 224  
U.S. government securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 41 32  
U.S. government securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 134 130  
U.S. government securities | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 526 577  
U.S. government securities | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 26 50  
U.S. government securities | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. government securities | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. government securities | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 212 146  
U.S. government securities | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 76 44  
U.S. corporate bonds | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 726 698  
U.S. corporate bonds | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 203 342  
U.S. corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 616 583  
U.S. corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 98 216  
U.S. corporate bonds | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. corporate bonds | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 71 74  
U.S. corporate bonds | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. corporate bonds | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
U.S. corporate bonds | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 110 115  
U.S. corporate bonds | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 34 52  
Non U.S. and other bonds | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 189 194  
Non U.S. and other bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 10 9  
Non U.S. and other bonds | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Non U.S. and other bonds | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Non U.S. and other bonds | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 179 185  
Hedge funds | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 426 408  
Hedge funds | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 11 10  
Hedge funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Hedge funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Hedge funds | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Hedge funds | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Hedge funds | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 144 128  
Hedge funds | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 11 10  
Hedge funds | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 282 280  
Hedge funds | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 145 151  
Private equity | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Private equity | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 145 151  
Private equity | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 139 171  
Structured credit | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 2 4  
Structured credit | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 139 171  
Structured credit | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 2 4  
Structured credit | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Structured credit | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Debt Security, Corporate, Non-US | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 141 2  
Debt Security, Corporate, Non-US | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 66 2  
Debt Security, Corporate, Non-US | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Debt Security, Corporate, Non-US | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Debt Security, Corporate, Non-US | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 75 0  
Real estate | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 441 474  
Real estate | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 26 30  
Real estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Real estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Real estate | Significant  Other Observable Inputs (Level 2) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Real estate | Significant  Other Observable Inputs (Level 2) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 0 0  
Real estate | Significant Unobservable Inputs (Level 3) | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 191 242  
Real estate | Significant Unobservable Inputs (Level 3) | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 2 5  
Real estate | Investments Measured at Net Asset Value | Pension Benefits      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category 250 232  
Real estate | Investments Measured at Net Asset Value | OPEB      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Fair value of pension assets by asset category $ 24 $ 25