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Segment and Related Information - Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,509	$ 1,482	$ 2,962	$ 2,823
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	922	910	1,813	1,750
European region
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	360	339	706	636
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	142	156	275	293
Rest of the world
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 85	$ 77	$ 168	$ 144

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

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