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Stock-Based Compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures      
Vesting period 3 years    
Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures      
Vesting period 1 year    
Restricted Stock Units and Restricted Stock
     
Unit and Shares Activity:      
Number of Awards - Nonvested - Beginning balance 3,261,562 4,858,972 4,812,657
Number of Awards - Granted - Annual 946,774 968,522 889,448
Number of Awards - Granted - Other 44,401 99,337 351,624
Number of Awards - Vested (1,100,095) (2,594,468) (1,077,816)
Number of Awards - Forfeited (47,281) (70,801) (116,941)
Number of Awards - Nonvested - Ending balance 3,105,361 3,261,562 4,858,972
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 $ 73.02 $ 68.75
Weighted Average Grant Date Fair Value - Granted - Annual $ 101.57 $ 87.92 $ 89.46
Weighted Average Grant Date Fair Value - Granted - Other $ 111.19 $ 85.07 $ 87.07
Weighted Average Grant Date Fair Value - Vested $ 79.93 $ 63.51 $ 72.21
Weighted Average Grant Date Fair Value - Forfeited $ 90.82 $ 82.65 $ 72.01
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 92.31 $ 85.17 $ 73.02
Vesting period 3 years    
Weighted average life of remaining vesting period 24 months    
Fair value that vested $ 114 $ 228 $ 102
Compensation expense yet to be recognized 77    
Tax benefit realized from vesting 43 86 36
Performance Shares
     
Unit and Shares Activity:      
Number of Awards - Nonvested - Beginning balance 1,089,084 878,872 760,645
Number of Awards - Granted - Annual 353,734 467,531 415,024
Number of Awards - Vested (507,083) 0 (206,410)
Number of Awards - Performance Change (6,949) (178,838) (39,323)
Number of Awards - Forfeited (33,151) (78,481) (51,064)
Number of Awards - Nonvested - Ending balance 895,635 1,089,084 878,872
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 $ 78.55 $ 73.99
Weighted Average Grant Date Fair Value - Granted - Annual $ 96.87 $ 81.55 $ 84.58
Weighted Average Grant Date Fair Value - Vested $ 75.16 $ 0 $ 72.77
Weighted Average Grant Date Fair Value - Performance Change $ 77.01 $ 81.27 $ 82.10
Weighted Average Grant Date Fair Value - Forfeited $ 91.34 $ 80.21 $ 80.20
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 88.12 $ 79.27 $ 78.55
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 52   18
Compensation expense yet to be recognized 14    
Tax benefit realized from vesting $ 16   $ 5
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