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Capital Stock (Details) (USD $) In Billions, except Share data in Millions	3 Months Ended
	Mar. 31, 2011
Capital Stock (Textuals) [Abstract]
Company retired all of common stock shares in treasury	125.4
Decrease in Treasury stock	$ 4.5
Decrease in Common stock	0.1
Decrease in Retained earnings	$ 4.4

Equity impact of the par value of shares of common and preferred stock retired from treasury during the period. This element is used only when Treasury Stock is accounted for under the par value versus the cost method.

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