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Stock Plans (Details Textuals) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Weighted-average grant date fair value of RSAs granted $ 45.11    
Stock Plans (Textuals) [Abstract]      
Common shares unissued and available for grant 38,000,000 40,000,000 37,000,000
Intrinsic value for options exercised $ 206 $ 130 $ 11
Cash received from the exercise of stock options 503 619 83
Tax benefit realized from income tax deductions from stock option exercises 60 35 2
Deferred Profit Sharing [Member]
     
Stock Plans (Textuals) [Abstract]      
Aggregate grant date fair value 10.5    
Total compensation expense 2.4 2.4 2.4
Chief Executive Officer [Member]
     
Stock Plans (Textuals) [Abstract]      
Non-qualified stock option awards granted to CEO 2,750,000    
Chief Executive Officer [Member] | Deferred Bonus [Member]
     
Stock Plans (Textuals) [Abstract]      
Aggregate grant date fair value 33.8    
Restricted Stock Awards [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Total fair value of shares vested 221 175 44
Weighted-average grant date fair value of RSAs granted $ 45.11 $ 38.63 $ 18.04
Liability Based Awards [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Cash paid upon vesting of PGs $ 64 $ 64 $ 71