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Postretirement Benefit Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net periodic benefit cost:        
Amortization of net actuarial loss $ 1 $ 1 $ 1 $ 1
Net periodic benefit cost 4 5 10 15
Domestic defined benefit pension plans        
Net periodic benefit cost:        
Service cost 1 1 2 2
Interest cost 1 1 3 3
Expected return on plan assets (2) (2) (4) (4)
Amortization of net actuarial loss 1 1 2 2
Net periodic benefit cost 1 1 3 3
International defined benefit pension plans        
Net periodic benefit cost:        
Service cost 3 3 8 9
Interest cost 6 6 18 18
Expected return on plan assets (8) (8) (25) (25)
Amortization of net actuarial loss 2 3 6 10
Net periodic benefit cost $ 3 $ 4 $ 7 $ 12