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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Accrued Liabilities, Current [Abstract]    
Voluntary Separation Program $ 85 $ 92
Profitsharing and savings plans 65 262
Vacation pay 456 451
Health 153 152
Workers compensation 138 141
Property and income taxes 61 65
Interest 107 46
Deferred supplier payments 0 80
Other 295 335
Accrued liabilities $ 1,360 $ 1,624