Acquisition of Businesses Pro Forma Table - Acquisition (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition, Pro Forma Revenue	$ 888	$ 759	$ 2,503	$ 2,225
Business Acquisition, Pro Forma Net Income (Loss)	172	157	495	530
International [Member]
Business Acquisition, Pro Forma Revenue	245		493
Business Acquisition, Pro Forma Net Income (Loss)	$ 50		$ 104

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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Period Type:	duration