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Stock-Based Compensation (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Y
Dec. 31, 2008
Summary of stock options outstanding and exercised under various stock options plans        
Stock options granted ,shares 4,063,369 5,417,631 14,316,237  
Stock options exercised ,shares (8,508,107) (5,769,586) (1,085,328)  
Stock options cancelled ,shares (5,354,026) (2,404,809) (7,144,451)  
Stock options outstanding at end of the period, shares 75,823,941 85,622,705 88,379,469 82,293,011
Stock options exercisable at end of the period, shares 57,039,334 57,542,065 50,538,048  
Weighted average exercise price, Granted $ 28.66 $ 23.98 $ 12.04  
Weighted average exercise price, Exercised $ 19.49 $ 19.38 $ 19.98  
Weighted average exercise price, Cancelled $ 28.44 $ 27.03 $ 28.33  
Weighted average exercise price outstanding at end of the period $ 27.60 $ 26.80 $ 26.49 $ 29.08
Weighted average exercise price, Exercisable $ 29.14 $ 28.28 $ 27.52  
Weighted average remaining contractual term outstanding, at the end of the period 5.2 5.5 6.1  
Weighted average remaining contractual term, Exercisable 4.4 4.4 4.5  
Aggregate intrinsic value, Outstanding $ (42) $ 15 $ (352)  
Aggregate intrinsic value, Exercisable $ (120) $ (76) $ (253)