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Stock-Based Compensation - RSU, RS, Performance Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Restricted Stock and Restricted Stock Units    
Unit and Shares Activity:    
Number of Shares - Nonvested - Beginning balance 1,722  
Number of Shares - Granted - Annual 747  
Number of Shares - Vested (441)  
Number of Shares - Forfeited (42)  
Number of Shares - Nonvested - Ending balance 1,986  
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 175.80  
Weighted Average Grant Date Fair Value - Vested 231.65  
Weighted Average Grant Date Fair Value - Forfeited 173.22  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 175.55  
Compensation expense yet to be recognized $ 124,000,000  
Expense recognition period 26 months  
Fair value that vested $ 79,000,000 $ 89,000,000
Tax benefit realized from vesting $ 15,000,000 17,000,000
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  
Number of Shares - Granted - Annual 163  
Number of Shares - Vested (115)  
Number of Shares - Performance Change 27  
Number of Shares - Forfeited (13)  
Number of Shares - Nonvested - Ending balance 485  
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 - Vested 228.80  
Weighted Average Grant Date Fair Value - Performance Change 177.41  
Weighted Average Grant Date Fair Value - Forfeited 171.82  
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 174.83  
Compensation expense yet to be recognized $ 32,000,000  
Expense recognition period 19 months  
Fair value that vested $ 22,000,000 35,000,000
Tax benefit realized from vesting $ 4,000,000 $ 7,000,000
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%