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Pensions and Other Benefits - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Cash contribution by employer to defined contribution plans $ 11 $ 1   $ 32 $ 16
Steelworkers Pension Trust          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Employer contributions, defined benefit plan       56  
Other Pension Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Employer contributions, defined benefit plan       10  
Unfunded Other Postretirement Benefit Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Cash contribution by employer for other postretirement benefits not funded by trusts       $ 31  
Pension Benefits          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Remeasurment impact     $ 255    
Funded status percentage     103.00%