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Earnings Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Earnings Per Share [Abstract]    
Net income $ 973 $ 250
Weighted-average shares outstanding 338,567,341 337,088,217
Share-based compensation plans 3,123,641 2,572,982
Adjusted weighted-average shares outstanding and assumed conversions 341,690,982 339,661,199
Basic earnings per share $ 2.87 $ 0.74
Diluted earnings per share $ 2.84 $ 0.73
Anti-dilutive share conversions 468,048 333,072