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Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share Details [Abstract]        
Net income $ 1,002 $ 785 $ 1,865 $ 1,424
Weighted-Average Number Of Shares Outstanding [Abstract]        
Basic 473.8 488.4 475.8 489.0
Dilutive effect of stock options 1.4 1.4 1.4 1.4
Dilutive effect of retention shares and units 2.0 2.6 2.1 2.9
Diluted 477.2 492.4 479.3 493.3
Earnings per share - basic $ 2.11 $ 1.61 $ 3.92 $ 2.91
Earnings per share - diluted $ 2.10 $ 1.59 $ 3.89 $ 2.89
Stock options excluded as their inclusion would be antidilutive 0.6 0.6 0.5 0.5