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Debt - Interest Cost Recognized (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Interest cost recognized for the period relating to the:        
Contractual interest coupon rate $ 2 $ 3 $ 8 $ 9
Amortization of the discount 7 7 22 21
Total interest cost recognized $ 9 $ 10 $ 30 $ 30