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Share Repurchase Program (Details) (2011 Repurchase Program, USD $) In Billions, except Share data in Millions, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended
	Aug. 31, 2011	Jun. 30, 2012	Jun. 30, 2012
2011 Repurchase Program
Share repurchase program
Maximum authorization under share repurchase program	$ 4.0
Repurchase of common stock (in shares)		26.6	44.7
Repurchase of common stock		1.2	2.0
Amount available for repurchases			$ 1.0

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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