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Pension and Other Postretirement Benefit Plans (Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
United States Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligation $ 3,415 $ 3,470
Accumulated benefit obligation 3,406 3,459
Fair value of plan assets 2,664 2,741
Foreign Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligation 720 730
Accumulated benefit obligation 699 690
Fair value of plan assets $ 383 $ 424