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Postretirement Benefit Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net periodic benefit cost:    
Amortization of net actuarial loss $ 1 $ 1
Net periodic benefit cost 2 3
Domestic defined benefit pension plans    
Net periodic benefit cost:    
Service cost 1 1
Interest cost 1 1
Expected return on plan assets (2) (2)
Amortization of net actuarial loss 1 1
Net periodic benefit cost 1 1
International defined benefit pension plans    
Net periodic benefit cost:    
Service cost 2 3
Interest cost 5 5
Expected return on plan assets (9) (8)
Amortization of net actuarial loss 2 2
Settlement/Curtailment 1 0
Net periodic benefit cost $ 1 $ 2