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Pension and Postretirement Benefit Plans - Aggregate Funding Levels of Defined Benefit Pension Plans (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
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 1,682 1,692
Projected benefit obligation 1,682 1,692
Fair value of plan assets 1,454 1,493
Foreign Pension Plan [Member]    
Plans with fair value of plan assets in excess of obligations:    
Accumulated benefit obligation 15 10
Projected benefit obligation 15 10
Fair value of plan assets 17 12
Plans with obligations in excess of fair value of plan assets:    
Accumulated benefit obligation 272 254
Projected benefit obligation 294 278
Fair value of plan assets $ 34 $ 28