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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
United States Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 2 $ 2
Interest cost 37 42 112 126
Expected return on plan assets (48) (49) (143) (145)
Amortization:        
Actuarial loss 13 11 40 32
Prior service credit 0 0 (2) (2)
Settlement and curtailment (gain) loss 0 0 0 0
Net periodic benefit cost (credit) 3 5 9 13
Foreign Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 4 4
Interest cost 8 4 23 13
Expected return on plan assets (8) (2) (25) (8)
Amortization:        
Actuarial loss 1 1 4 4
Prior service credit 0 0 0 0
Settlement and curtailment (gain) loss 1 0 13 2
Net periodic benefit cost (credit) 3 4 19 15
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 2
Interest cost 4 7 14 19
Expected return on plan assets 0 0 0 0
Amortization:        
Actuarial loss 0 0 0 0
Prior service credit (5) (10) (19) (29)
Settlement and curtailment (gain) loss (16) 0 (63) 0
Net periodic benefit cost (credit) $ (16) $ (2) $ (66) $ (8)