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Share-Based Compensation Other Share-Based Compensation Data (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Share-Based Compensation Data [Line Items]      
Share-based compensation $ 421 $ 401 $ 326
Allocated Share-based Compensation Expense, Net of Tax 299 260 278
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options 461 170 78
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 307    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 1 month 6 days    
Stock Options and SARs [Member]
     
Other Share-Based Compensation Data [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 18 $ 15 $ 13
Total intrinsic value of stock options and SARs exercised 559 327 164
Restricted Stock Units (RSUs) [Member]
     
Other Share-Based Compensation Data [Line Items]      
Weighted-average grant date fair value (per share) $ 52 $ 42 $ 32
Total fair value of restricted shares vested $ 716 $ 113 $ 99
Employee Stock Purchase Plan (ESPP) [Member]
     
Other Share-Based Compensation Data [Line Items]      
Stock Issued During Period, Shares, Employee Stock Purchase Plans 3 3 4