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Pension and Other Postretirement Benefit Plans (Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
United States Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligation $ 3,470 $ 3,796
Accumulated benefit obligation 3,459 3,786
Fair value of plan assets 2,741 3,042
Foreign Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligation 730 872
Accumulated benefit obligation 690 825
Fair value of plan assets $ 424 $ 487