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Business Combinations (Details 4) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Supplemental Pro Forma Data
Pro forma net revenue	$ 5,995	$ 5,940
Pro forma net income	$ 579	$ 430
Pro forma net income per share (basic) (usd per share)	$ 1.04	$ 0.80
Pro forma net income per share (diluted) (usd per share)	$ 1.00	$ 0.76

- Definition

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.

+ References+ Details

- Definition

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.

+ References+ Details