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Pension and Postretirement Benefit Plans - Aggregate Funding Levels of Defined Benefit Pension Plans (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
United States Pension Plan of US Entity [Member]    
Plans with fair value of plan assets in excess of obligations:    
Accumulated benefit obligation $ 0 $ 0
Projected benefit obligation
Fair value of plan assets
Plans with obligations in excess of fair value of plan assets:    
Accumulated benefit obligation $ 1,692 $ 1,823
Projected benefit obligation 1,692 1,823
Fair value of plan assets 1,493 1,622
Foreign Pension Plan [Member]    
Plans with fair value of plan assets in excess of obligations:    
Accumulated benefit obligation 10 14
Projected benefit obligation 10 14
Fair value of plan assets 12 16
Plans with obligations in excess of fair value of plan assets:    
Accumulated benefit obligation 254 283
Projected benefit obligation 278 311
Fair value of plan assets $ 28 $ 28