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Stock-Based Compensation - RSU, RS, Performance Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Restricted Stock and Restricted Stock Units    
Unit and Shares Activity:    
Number of Shares - Nonvested - Beginning balance 1,994  
Number of Shares - Granted - Annual 467  
Number of Shares - Granted - Other 6  
Number of Shares - Vested (633)  
Number of Shares - Forfeited (34)  
Number of Shares - Nonvested - Ending balance 1,800  
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 $ 162.60  
Weighted Average Grant Date Fair Value - Granted - Annual 233.61  
Weighted Average Grant Date Fair Value - Granted - Other 208.36  
Weighted Average Grant Date Fair Value - Vested 164.40  
Weighted Average Grant Date Fair Value - Forfeited 186.02  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 180.11  
Compensation expense yet to be recognized $ 92  
Expense recognition period 23 months  
Fair value that vested $ 154 $ 135
Tax benefit realized from vesting $ 29 44
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 Shares - Nonvested - Beginning balance 686  
Number of Shares - Granted - Annual 166  
Number of Shares - Vested (206)  
Number of Shares - Performance Change (49)  
Number of Shares - Forfeited (28)  
Number of Shares - Nonvested - Ending balance 569  
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 $ 171.90  
Weighted Average Grant Date Fair Value - Granted - Annual 229.13  
Weighted Average Grant Date Fair Value - Vested 159.82  
Weighted Average Grant Date Fair Value - Performance Change 196.85  
Weighted Average Grant Date Fair Value - Forfeited 204.09  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 189.19  
Compensation expense yet to be recognized $ 31  
Expense recognition period 10 months  
Fair value that vested $ 48 55
Tax benefit realized from vesting $ 11 $ 15
Vesting or performance period 3 years  
Performance shares awarded at estimated number of shares at the end of the performance period 100.00%  
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%