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Stockholders' Equity 2 (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended	1 Months Ended
	Jan. 24, 2012	Dec. 31, 2011	May 31, 2011 May 12, 2011 plan [Member]
Stock Repurchase Program [Line Items]
Stock repurchase program, authorized amount	$ 1,500		$ 500
Stockholders' Equity (Textual) [Abstract]
Remaining authorized amount of common stock under common stock repurchase program		232
Common Stock Share		25.7
Common Stock Value		$ 550

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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