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Stock-Based Compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Restricted Stock Units and Restricted Stock
   
Unit and Shares Activity:    
Number of Awards - Nonvested - Beginning balance 3,105,361  
Number of Awards - Granted - Annual 798,615  
Number of Awards - Granted - Other 1,193  
Number of Awards - Vested (1,051,124)  
Number of Awards - Forfeited (14,949)  
Number of Awards - Nonvested - Ending balance 2,839,096  
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 $ 92.31  
Weighted Average Grant Date Fair Value - Granted - Annual $ 126.79  
Weighted Average Grant Date Fair Value - Granted - Other $ 132.51  
Weighted Average Grant Date Fair Value - Vested $ 90.60  
Weighted Average Grant Date Fair Value - Forfeited $ 99.98  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 102.62  
Vesting period 3 years  
Weighted average life of remaining vesting period 27 months  
Fair value that vested $ 138 $ 105
Compensation expense yet to be recognized 128  
Tax benefit realized from vesting 52 39
Performance Shares
   
Unit and Shares Activity:    
Number of Awards - Nonvested - Beginning balance 895,635  
Number of Awards - Granted - Annual 263,674  
Number of Awards - Vested (277,357)  
Number of Awards - Performance Change (36,160)  
Number of Awards - Forfeited (4,142)  
Number of Awards - Nonvested - Ending balance 841,650  
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 $ 88.12  
Weighted Average Grant Date Fair Value - Granted - Annual $ 122.85  
Weighted Average Grant Date Fair Value - Vested $ 84.74  
Weighted Average Grant Date Fair Value - Performance Change $ 100.19  
Weighted Average Grant Date Fair Value - Forfeited $ 90.80  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 99.58  
Weighted average life of remaining vesting period 11 months  
Share-based compensation arrangement by share-based payment award, award vesting or performance period 3 years  
Fair value that vested 35 52
Compensation expense yet to be recognized 40  
Tax benefit realized from vesting $ 11 $ 16
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