Consolidated Statements of Comprehensive Income (Parenthetical) $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($)
Statement Of Income And Comprehensive Income [Abstract]
Gains (losses) from net investment hedging, net of tax	$ 19
Gains from net investment hedging, tax	$ 11

Current period adjustment resulting from gains and losses on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity, net of tax effect.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-Subparagraph (b),(c)
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Name:	us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTaxPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration