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Stock-Based Compensation - RSU, RS, Performance Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Restricted Stock Units and Restricted Stock    
Unit and Shares Activity:    
Number of Awards - Nonvested - Beginning balance 2,817,786  
Number of Awards - Granted - Annual 671,204  
Number of Awards - Granted - Other 18,375  
Number of Awards - Vested (1,005,131)  
Number of Awards - Forfeited (44,907)  
Number of Awards - Nonvested - Ending balance 2,457,327  
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 $ 104.41  
Weighted Average Grant Date Fair Value - Granted - Annual 165.86  
Weighted Average Grant Date Fair Value - Granted - Other 160.63  
Weighted Average Grant Date Fair Value - Vested 89.88  
Weighted Average Grant Date Fair Value - Forfeited 118.19  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 127.30  
Compensation expense yet to be recognized $ 102  
Expense recognition period 25 months  
Fair value that vested $ 165 $ 144
Tax benefit realized from vesting $ 62 54
Vesting or performance period 3 years  
Value of dividend equivalents for restricted stock units that are forfeited $ 0  
Impact on basic earnings per share due to restricted stock units dividends $ 0  
Performance Shares    
Unit and Shares Activity:    
Number of Awards - Nonvested - Beginning balance 1,099,752  
Number of Awards - Granted - Annual 227,798  
Number of Awards - Vested (323,938)  
Number of Awards - Performance Change (95,316)  
Number of Awards - Forfeited (20,834)  
Number of Awards - Nonvested - Ending balance 887,462  
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 $ 102.65  
Weighted Average Grant Date Fair Value - Granted - Annual 158.88  
Weighted Average Grant Date Fair Value - Vested 83.08  
Weighted Average Grant Date Fair Value - Performance Change 129.73  
Weighted Average Grant Date Fair Value - Forfeited 123.02  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 120.84  
Compensation expense yet to be recognized $ 25  
Expense recognition period 10 months  
Fair value that vested $ 54 35
Tax benefit realized from vesting $ 15 $ 11
Vesting or performance period 3 years  
Performance Shares | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures    
Expense recognition period 3 years  
Number of shares to be delivered based on percent of each performance share granted upon satisfaction of performance conditions 200.00%  
Performance Shares | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures    
Expense recognition period 1 year  
Number of shares to be delivered based on percent of each performance share granted upon satisfaction of performance conditions 0.00%