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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, 2016
Dec. 31, 2015
U.S Pension Plans    
Projected Benefit Obligation Exceeds the Fair Value of Plan Assets    
Projected benefit obligations $ 1,956 $ 2,190
Accumulated benefit obligation 1,956 2,160
Fair value of plan assets 1,654 1,909
Accumulated Benefit Obligations Exceeds the Fair Value of Plan Assets    
Projected benefit obligations 1,956 2,190
Accumulated benefit obligation 1,956 2,160
Fair value of plan assets 1,654 1,909
Non-U.S. Pension Plans    
Projected Benefit Obligation Exceeds the Fair Value of Plan Assets    
Projected benefit obligations 897 876
Accumulated benefit obligation 867 850
Fair value of plan assets 632 645
Accumulated Benefit Obligations Exceeds the Fair Value of Plan Assets    
Projected benefit obligations 897 876
Accumulated benefit obligation 867 850
Fair value of plan assets $ 632 $ 645