Other Comprehensive (Loss) Income Other Comprehensive (Loss) Income - Comprehensive Income Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unrealized (gain) loss on sales hedging:
Unrealized loss on anticipated sales hedging transactions (net of income taxes)	$ (6)	$ 7	$ 0
Unrealized loss/(gain) on forward interest rate swaps:
Net of taxes	(7)	(8)	0
Unrealized (gain) loss on investments
Foreign currency translation adjustment	(26)	1	1
Reclassification out of Accumulated Other Comprehensive Income
Unrealized (gain) loss on investments
Foreign currency translation adjustment	(15)	0	0
Total amounts reclassified from AOCI	(26)	1	2
Sales | Unrealized losses) gains on sales hedging | Reclassification out of Accumulated Other Comprehensive Income
Unrealized (gain) loss on sales hedging:
Total before tax	(15)	1	3
Income tax (benefit) expense	3	0	(1)
Unrealized loss on anticipated sales hedging transactions (net of income taxes)	(12)	1	2
Investment Income (Expense) | Accumulated Unrealized Gains Losses Net on Interest Rate Swap | Reclassification out of Accumulated Other Comprehensive Income
Unrealized loss/(gain) on forward interest rate swaps:
Total before tax	1	0	0
Tax expense (benefit)	0	0	0
Net of taxes	1	0	0
Other Nonoperating Income (Expense) | Unrealized gains (losses) on investments | Reclassification out of Accumulated Other Comprehensive Income
Unrealized (gain) loss on investments
Total before tax	0	0	0
Tax expense (benefit)	0	0	0
Net of taxes	$ 0	$ 0	$ 0