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Employee Benefit Plans - Unobservable Input Reconciliation (Details) - Foreign Plan [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets as of January 1 $ 978 $ 1,009
Fair value of plan assets as of December 31 1,086 978
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 1 124 133
Realized and unrealized gains and losses, net 7 (8)
Purchases, sales and settlements, net 0 1
Transfers, net 0 (2)
Fair value of plan assets as of December 31 $ 131 $ 124