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Employee Benefit Plans - Change Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets — beginning of year $ 3,914 $ 3,344
Actual return on plan assets 568 701
Employer contributions [1] 70 70
Benefits paid (177) (176)
Expenses paid (12) (26)
Foreign exchange adjustment 0 1
Fair value of plan assets — end of year 4,363 3,914
Funded status — end of year (512) (584)
Other Postretirement Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets — beginning of year 75 85
Actual return on plan assets 6 12
Employer contributions [1] 5 0
Benefits paid (23) (22)
Expenses paid 0 0
Foreign exchange adjustment 0 0
Fair value of plan assets — end of year 63 75
Funded status — end of year $ (157) $ (148)