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Employee Benefit Plans (Accumulated Benefit Obligation in Excess of Plan Assets) (Details) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligations $ 2,881 $ 2,791
Accumulated benefit obligations 2,601 2,485
Fair value of plan assets 2,274 2,023
Int’l.    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligations 1,055 351
Accumulated benefit obligations 880 303
Fair value of plan assets $ 796 $ 160