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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
Net periodic benefit cost:        
Amortization of net actuarial loss $ (1) $ (1) $ (1) $ (1)
Net periodic benefit cost 5 5 15 16
Domestic defined benefit pension plans        
Net periodic benefit cost:        
Service cost 1 1 2 2
Interest cost 1   3 2
Expected return on plan assets (2) (1) (4) (3)
Amortization of net actuarial loss 1   2 1
Net periodic benefit cost 1   3 2
International defined benefit pension plans        
Net periodic benefit cost:        
Service cost 3 3 9 11
Interest cost 6 8 18 22
Expected return on plan assets (8) (8) (25) (25)
Amortization of net actuarial loss 3 2 10 6
Net periodic benefit cost $ 4 $ 5 $ 12 $ 14