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Employee Benefit Plans - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - Pension Benefits - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
U.S.    
Pension Plans With Accumulated Benefit Obligation in Excess of Plan Assets    
Projected benefit obligations $ 1,957 $ 15,103
Accumulated benefit obligations 1,665 13,545
Fair value of plan assets 55 9,842
Int’l.    
Pension Plans With Accumulated Benefit Obligation in Excess of Plan Assets    
Projected benefit obligations 1,097 2,084
Accumulated benefit obligations 883 1,622
Fair value of plan assets $ 2 $ 600