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Employee Benefit Plans - Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Foreign Plan [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets as of January 1 $ 1,086 $ 978
Fair value of plan assets as of December 31 953 1,086
Foreign Plan [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets as of January 1 131 124
Realized and unrealized gains and losses, net 0 7
Purchases, sales and settlements, net 0 0
Transfers, net (2) 0
Fair value of plan assets as of December 31 129 131
U.S. Pension Benefits    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets as of January 1 1,444 1,722
Fair value of plan assets as of December 31 1,269 1,444
U.S. Pension Benefits | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets as of January 1 0  
Fair value of plan assets as of December 31 $ 0 $ 0