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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
United States Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 1 $ 1
Interest cost 37 37 74 75
Expected return on plan assets (46) (47) (93) (95)
Amortization:        
Actuarial loss 11 14 23 27
Prior service credit (1) (1) (2) (2)
Settlement and curtailment (gain) loss 0 0 0 0
Net periodic cost 1 3 3 6
Foreign Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2 2 3 3
Interest cost 7 7 14 15
Expected return on plan assets (8) (9) (16) (17)
Amortization:        
Actuarial loss 1 2 2 3
Prior service credit 0 0 0 0
Settlement and curtailment (gain) loss (1) 4 0 12
Net periodic cost 1 6 3 16
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2 0 4 1
Interest cost 4 5 8 10
Expected return on plan assets 0 0 0 0
Amortization:        
Actuarial loss 0 0 0 0
Prior service credit (4) (5) (8) (14)
Settlement and curtailment (gain) loss 0 0 0 (47)
Net periodic cost $ 2 $ 0 $ 4 $ (50)