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Stock-Based Compensation - RSU, RS, Performance Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restricted Stock and Restricted Stock Units    
Unit and Shares Activity:    
Number of Awards - Nonvested - Beginning balance 2,185,046  
Number of Awards - Granted - Annual 604,256  
Number of Awards - Granted - Other 571  
Number of Awards - Vested (724,705)  
Number of Awards - Forfeited (12,014)  
Number of Awards - Nonvested - Ending balance 2,053,154  
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 $ 145.64  
Weighted Average Grant Date Fair Value - Granted - Annual 176.10  
Weighted Average Grant Date Fair Value - Granted - Other 175.17  
Weighted Average Grant Date Fair Value - Vested 127.57  
Weighted Average Grant Date Fair Value - Forfeited 153.49  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 160.94  
Compensation expense yet to be recognized $ 133  
Expense recognition period 26 months  
Fair value that vested $ 127 $ 133
Tax benefit realized from vesting $ 47 50
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 656,278  
Number of Awards - Granted - Annual 181,898  
Number of Awards - Vested (312,173)  
Number of Awards - Performance Change 110,965  
Number of Awards - Forfeited (1,682)  
Number of Awards - Nonvested - Ending balance 635,286  
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 $ 142.98  
Weighted Average Grant Date Fair Value - Granted - Annual 189.75  
Weighted Average Grant Date Fair Value - Vested 124.63  
Weighted Average Grant Date Fair Value - Performance Change 174.05  
Weighted Average Grant Date Fair Value - Forfeited 159.53  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 170.77  
Compensation expense yet to be recognized $ 51  
Expense recognition period 12 months  
Fair value that vested $ 55 54
Tax benefit realized from vesting $ 15 $ 15
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%