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Stock Plans (Details Textuals) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Plans Details [Abstract]      
Common shares unissued and available for grant 35,000,000 36,000,000 38,000,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value of RSAs granted $ 60.13    
Chief Executive Officer [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Non-qualified stock option awards granted to CEO 2,750,000    
Contractual term in years of stock option awards 10    
Vesting period in years of stock option awards 6    
Chief Executive Officer [Member] | Market-based conditions [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Aggregate grant date fair value $ 10,500,000    
Total compensation expense 300,000 500,000 2,400,000
Chief Executive Officer [Member] | Performance-based conditions [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Aggregate grant date fair value 33,800,000    
Total compensation expense 0 0 0
Stock Option [Member]
     
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Contractual term in years of stock option awards 10    
Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting rights Stock options generally vest 25 percent per year beginning with the first anniversary of the grant date.    
Intrinsic value for options exercised 374,000,000 209,000,000 206,000,000
Cash received from the exercise of stock options 580,000,000 368,000,000 503,000,000
Tax benefit realized from income tax deductions from stock option exercises 84,000,000 45,000,000 60,000,000
Restricted Stock Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting rights RSAs are valued based on the stock price on the date of grant and generally vest 25 percent per year, beginning with the first anniversary of the grant date.    
Total fair value of shares vested 336,000,000 296,000,000 221,000,000
Weighted-average grant date fair value of RSAs granted $ 60.13 $ 49.80 $ 45.11
Liability-Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash paid upon vesting of PGs $ 45,000,000 $ 66,000,000 $ 58,000,000