Business Combinations (Details) (USD $) In Millions, except Per Share data	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Supplemental Pro Forma Data
Pro forma net revenue	$ 3,635	$ 3,141
Pro forma net income	$ 389	$ 437
Pro forma net income per share (basic)	$ 0.72	$ 0.88
Pro forma net income per share (diluted)	$ 0.69	$ 0.82

The pro forma basic net income per share for a 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 Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph r(2, 3)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 54

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 55

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period

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The pro forma net income (loss) for the period as if the business combination or combinations had been completed at the beginning of a period

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period

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