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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
United States Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1 $ 1
Interest cost 37 38
Expected return on plan assets (47) (48)
Amortization:    
Actuarial loss 12 13
Prior service credit (1) (1)
Settlement and curtailment (gain) loss 0 0
Net periodic benefit cost (credit) 2 3
Foreign Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 7 8
Expected return on plan assets (8) (8)
Amortization:    
Actuarial loss 1 1
Prior service credit 0 0
Settlement and curtailment (gain) loss 1 8
Net periodic benefit cost (credit) 2 10
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 2 1
Interest cost 4 5
Expected return on plan assets 0 0
Amortization:    
Actuarial loss 0 0
Prior service credit (4) (9)
Settlement and curtailment (gain) loss 0 (47)
Net periodic benefit cost (credit) $ 2 $ (50)