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Stock Based Compensation Plans (Nonvested Performance Share Unit Awards and Restricted Share Unit Awards - Rollforward) (Details) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average grant date fair value, vested/released (in dollars per share) $ 154.91 $ 198.28 $ 161.04
Nonvested Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 685,000    
Granted (in shares) 182,000    
Vested/Released (in shares) (221,000)    
Forfeitures (in shares)    
Outstanding, ending balance (in shares) 646,000 685,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average grant date fair value, beginning of period (in dollars per share) $ 161.20    
Weighted-average grant date fair value, granted (in dollars per share) 147.85    
Weighted-average grant date fair value, vested/released (in dollars per share) 137.67    
Weighted-average grant date fair value, forfeitures (in dollars per share)    
Weighted-average grant date fair value, end of period (in dollars per share) $ 165.48 $ 161.20  
Nonvested Restricted Share / Restricted Share Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning balance (in shares) 3,348,000    
Granted (in shares) 1,683,000    
Vested/Released (in shares) (1,170,000)    
Forfeitures (in shares) (99,000)    
Outstanding, ending balance (in shares) 3,762,000 3,348,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average grant date fair value, beginning of period (in dollars per share) $ 172.40    
Weighted-average grant date fair value, granted (in dollars per share) 155.67    
Weighted-average grant date fair value, vested/released (in dollars per share) 156.89    
Weighted-average grant date fair value, forfeitures (in dollars per share) 171.03    
Weighted-average grant date fair value, end of period (in dollars per share) $ 169.79 $ 172.40  
Nonvested Performance Units with Market Conditions      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, ending balance (in shares) 170