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Stock-Based Compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 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 15,647  
Number of Awards - Vested (1,066,382)  
Number of Awards - Forfeited (33,543)  
Number of Awards - Nonvested - Ending balance 2,819,698  
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 $ 141.58  
Weighted Average Grant Date Fair Value - Vested $ 90.63  
Weighted Average Grant Date Fair Value - Forfeited $ 100.63  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 102.89  
Vesting period 3 years  
Weighted average life of remaining vesting period 25 months  
Fair value that vested $ 140 $ 106
Compensation expense yet to be recognized 110  
Tax benefit realized from vesting 53 40
Performance Shares
   
Unit and Shares Activity:    
Number of Awards - Nonvested - Beginning balance 895,635  
Number of Awards - Granted - Annual 285,149  
Number of Awards - Vested (277,357)  
Number of Awards - Performance Change 59,443  
Number of Awards - Forfeited (6,501)  
Number of Awards - Nonvested - Ending balance 956,369  
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 $ 123.88  
Weighted Average Grant Date Fair Value - Vested $ 84.74  
Weighted Average Grant Date Fair Value - Performance Change $ 114.15  
Weighted Average Grant Date Fair Value - Forfeited $ 102.45  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 101.28  
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 35 52
Compensation expense yet to be recognized 35  
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