Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Multiemployer Plan (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Multiemployer Plan (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Nov. 01, 2022
USD ($)
Oct. 31, 2022
USD ($)
Multiemployer Plan [Line Items]          
Contributions $ 143,000,000 $ 115,000,000 $ 104,000,000    
Contribution per eligible hour       $ 4.00 $ 0.50
Steelworkers Pension Trust          
Multiemployer Plan [Line Items]          
Pension Plan EIN 236648508        
Pension Plan Number 499        
Pension Protection Act Zone Status Green Green      
FIP/RP Status Pending/Implemented No        
Contributions $ 119,000,000 $ 93,000,000 88,000,000    
Surcharge Imposed No        
Total actuarial liability   6,378,000,000      
Market value of assets   $ 5,827,000,000      
Funded ratio   0.91      
IAM National Pension Fund's National Pension Plan          
Multiemployer Plan [Line Items]          
Pension Plan EIN 516031295        
Pension Plan Number 002        
Pension Protection Act Zone Status Red Red      
FIP/RP Status Pending/Implemented Implemented        
Contributions $ 23,000,000 $ 22,000,000 16,000,000    
Surcharge Imposed Yes        
Other Plans          
Multiemployer Plan [Line Items]          
Contributions $ 1,000,000 $ 0 $ 0