CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 207us-gaap_NetIncomeLoss	$ 172us-gaap_NetIncomeLoss
Other comprehensive (loss) income:
Foreign currency translation adjustments	(26)	0
Derivative instrument adjustments, net of tax	9	1
Unrealized gain on available-for-sale securities, net of tax	(1)	1
Reclassification of losses (gains), net of tax	(2)	1
Total other comprehensive (loss) income, net of tax	(20)	3
Comprehensive income	$ 187us-gaap_ComprehensiveIncomeNetOfTax	$ 175us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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