Earnings Per Share and Equity (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Earnings Per Share And Equity Additional Narrative Information [Abstract]
Stock options not included in the calculation of diluted common shares outstanding	11,000,000	9,000,000
Treasury Stock, Shares held	35,000,000		35,000,000
Treasury stock, at cost	$ 2,327,000,000		$ 2,327,000,000
Earnings Per Share Diluted
Net income	$ 200,000,000	$ 669,000,000
Average common shares outstanding - basic	705,000,000	662,000,000
Assumed exercise of stock options, performance share awards and restricted stock	2,000,000	2,000,000
Average common shares outstanding - diluted	707,000,000	664,000,000