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Capital Stock (Details) (USD $) In Billions, except Share data in Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2011
Capital Stock (Textual) [Abstract]
Shares of common stock in treasury retired by the Company	125.4
Decreases in Treasury stock	$ 4.50
Decrease in Common Stock Due to Retirement of Treasury Stock	0.10
Decrease in Retained Earnings Due to Retirement of Treasury Stock	$ 4.40

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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