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Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net revenues	$ 1,325	$ 1,668	$ 1,651	$ 1,062	$ 1,278	$ 1,531	$ 1,512	$ 1,007	$ 5,706	$ 5,328	$ 5,289
Total assets	7,531				7,304				7,531	7,304	7,092
Net property and equipment	254				233				254	233	205
United States [Member]
Segment Reporting Information [Line Items]
Net revenues									5,579	5,201	5,167
Total assets	7,450				7,219				7,450	7,219	6,998
Net property and equipment	252				232				252	232	204
All Other Countries [Member]
Segment Reporting Information [Line Items]
Net revenues									127	127	122
Total assets	81				85				81	85	94
Net property and equipment	$ 2				$ 1				$ 2	$ 1	$ 1

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.18)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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