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Treasury Stock (Details) (USD $) Share data in Millions, unless otherwise specified	1 Months Ended		3 Months Ended			6 Months Ended
	Jun. 30, 2012	Aug. 31, 2011	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Treasury Stock
Share repurchase authorized		$ 1,500,000,000	$ 3,000,000,000		$ 1,500,000,000
Number of shares repurchased				3.1		6.5
Amount of shares repurchased				$ 500,000,000		$ 1,000,000,000
Number of shares repurchased and retired	9.6

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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