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Stock-Based Compensation (Details 4) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Restricted Stock Units and Restricted Stock
   
Unit and Shares Activity:    
Number of Awards - Nonvested - Beginning balance 3,261,562  
Number of Awards - Granted - Annual 946,774  
Number of Awards - Granted - Other 41,386  
Number of Awards - Vested (1,093,895)  
Number of Awards - Forfeited (42,841)  
Number of Awards - Nonvested - Ending balance 3,112,986  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures    
Weighted Average Grant Date Fair Value - Nonvested - Beginning balance $ 85.17  
Weighted Average Grant Date Fair Value - Granted - Annual $ 101.57  
Weighted Average Grant Date Fair Value - Granted - Other $ 103.29  
Weighted Average Grant Date Fair Value - Vested $ 79.94  
Weighted Average Grant Date Fair Value - Forfeited $ 90.43  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 92.16  
Vesting period 3 years  
Weighted average life of remaining vesting period 25 months  
Fair value that vested $ 113 $ 225
Compensation expense yet to be recognized 94  
Tax benefit realized from vesting 42 84
Performance Shares
   
Unit and Shares Activity:    
Number of Awards - Nonvested - Beginning balance 1,089,084  
Number of Awards - Granted - Annual 345,948  
Number of Awards - Vested (507,083)  
Number of Awards - Performance Change (9,615)  
Number of Awards - Forfeited (27,792)  
Number of Awards - Nonvested - Ending balance 890,542  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures    
Weighted Average Grant Date Fair Value - Nonvested - Beginning balance $ 79.27  
Weighted Average Grant Date Fair Value - Granted - Annual $ 96.33  
Weighted Average Grant Date Fair Value - Vested $ 75.16  
Weighted Average Grant Date Fair Value - Performance Change $ 82.32  
Weighted Average Grant Date Fair Value - Forfeited $ 90.48  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 87.86  
Performance criteria, number of key factors 3  
Weighted average life of remaining vesting period 10 months  
Share-based compensation arrangement by share-based payment award, award vesting or performance period 3 years  
Fair value that vested 52 0
Compensation expense yet to be recognized 20  
Tax benefit realized from vesting $ 16 $ 0
Performance Shares | Maximum
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures    
Number of shares to be delivered based on percent of each performance share granted upon satisfaction of performance conditions 200.00%  
Vesting period 3 years  
Performance Shares | Minimum
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures    
Number of shares to be delivered based on percent of each performance share granted upon satisfaction of performance conditions 0.00%  
Vesting period 1 year