Stockholders' Equity 2 (Details) (USD $) In Millions	3 Months Ended	1 Months Ended
Jun. 30, 2011	Jun. 30, 2010	May 31, 2011 May 12, 2011 plan [Member]
Stockholders Equity (Textuals) [Abstract]
Stock repurchase program, authorized amount			$ 500
Additional Stockholders Equity (Textuals) [Abstract]
Remaining authorized amount of common stock under common stock repurchase program	632
Common Stock Share	6.4
Common Stock Value	150
Cash payment for repurchased common stock	$ 153	$ 55

The cash outflow to reacquire common stock during the period.

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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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