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Earnings Per Share (Details) (USD $)
In Millions, except Per Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Basic earnings per share [Abstract]    
Net Income$ 298$ 572$ 1,226$ 1,554
Weighted average shares outstanding285.7314.4292.6323.9
Basic earnings per share$ 1.04$ 1.82$ 4.19$ 4.80
Diluted earnings per share [Abstract]    
Net Income$ 298$ 572$ 1,226$ 1,554
Weighted average shares outstanding285.7314.4292.6323.9
Additional shares from assumed issuance of shares under stock-based compensation awards2.12.91.82.4
Weighted average shares and potential shares assumed outstanding for computing diluted earnings per share287.8317.3294.4326.3
Diluted earnings per share$ 1.04$ 1.80$ 4.16$ 4.76