Quarterly report [Sections 13 or 15(d)]

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Net periodic benefit costs (credits) $ (57) $ (62) $ (157) $ (184)
Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 7 7 21 21
Interest cost 53 54 158 163
Expected return on plan assets (79) (80) (238) (240)
Prior service credits 4 5 13 13
Net actuarial loss (gain) (2) 0 (6) 0
Net periodic benefit costs (credits) (17) (14) (52) (43)
Defined benefit pension contributions 22 75 51 91
Defined benefit plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 2 2 6 6
Interest cost 14 13 43 38
Expected return on plan assets (11) (11) (32) (32)
Termination benefits 0 0 15 2
Prior service credits (3) (4) (10) (12)
Net actuarial loss (gain) (33) (39) (100) (116)
Net periodic benefit costs (credits) (31) (39) (78) (114)
OPEB contributions $ 0 $ 0 $ 0 $ 0