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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
United States Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost 37 37 111 112
Expected return on plan assets (47) (48) (140) (143)
Amortization:        
Actuarial loss 12 13 35 40
Prior service credit 0 0 (2) (2)
Settlement and curtailment (gain) loss 0 0 0 0
Net periodic benefit cost (credit) 3 3 6 9
Foreign Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 4 4
Interest cost 7 8 21 23
Expected return on plan assets (7) (8) (23) (25)
Amortization:        
Actuarial loss 1 1 3 4
Prior service credit 0 0 0 0
Settlement and curtailment (gain) loss 1 1 1 13
Net periodic benefit cost (credit) 3 3 6 19
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 5 2
Interest cost 5 4 13 14
Expected return on plan assets 0 0 0 0
Amortization:        
Actuarial loss 0 0 0 0
Prior service credit (3) (5) (11) (19)
Settlement and curtailment (gain) loss 0 (16) 0 (63)
Net periodic benefit cost (credit) $ 3 $ (16) $ 7 $ (66)