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Pensions Benefit Plans and Other Postretirement Benefits - Projected and Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
U.S. Pension Plans    
Projected Benefit Obligation Exceeds the Fair Value of Plan Assets    
Projected benefit obligations $ 1,650 $ 1,956
Accumulated benefit obligation 1,650 1,956
Fair value of plan assets 1,394 1,654
Accumulated Benefit Obligations Exceeds the Fair Value of Plan Assets    
Projected benefit obligations 1,650 1,956
Accumulated benefit obligation 1,650 1,956
Fair value of plan assets 1,394 1,654
Non-U.S. Pension Plans    
Projected Benefit Obligation Exceeds the Fair Value of Plan Assets    
Projected benefit obligations 905 897
Accumulated benefit obligation 878 867
Fair value of plan assets 682 632
Accumulated Benefit Obligations Exceeds the Fair Value of Plan Assets    
Projected benefit obligations 261 897
Accumulated benefit obligation 241 867
Fair value of plan assets $ 39 $ 632