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Stock-Based Compensation - RSU, RS, Performance Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restricted Stock and Restricted Stock Units    
Unit and Shares Activity:    
Number of Shares - Nonvested - Beginning balance 1,722,000  
Number of Shares - Granted - Annual 721,000  
Number of Shares - Vested (433,000)  
Number of Shares - Forfeited (33,000)  
Number of Shares - Nonvested - Ending balance 1,977,000  
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 $ 189.78  
Weighted Average Grant Date Fair Value - Granted - Annual 175.09  
Weighted Average Grant Date Fair Value - Vested 232.62  
Weighted Average Grant Date Fair Value - Forfeited 173.54  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 175.31  
Compensation expense yet to be recognized $ 141  
Expense recognition period 27 months  
Fair value that vested $ 78 $ 88
Tax benefit realized from vesting $ 14 16
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 423,000  
Number of Shares - Granted - Annual 163,000  
Number of Shares - Distributed (115,000)  
Number of Shares - Performance Change 17,000  
Number of Shares - Forfeited (4,000)  
Number of Shares - Nonvested - Ending balance 484,000  
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 $ 188.61  
Weighted Average Grant Date Fair Value - Granted - Annual $ 176.41  
Weighted Average Grant Date Fair Value - Distributed 228.80  
Weighted Average Grant Date Fair Value - Performance Change $ 178.43  
Weighted Average Grant Date Fair Value - Forfeited 172.92  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 174.75  
Compensation expense yet to be recognized $ 40  
Expense recognition period 21 months  
Fair value that vested $ 22 35
Tax benefit realized from vesting $ 4 $ 7
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%