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Equity (Restricted Stock, Performance Share Awards and Options) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock Awards [Member]      
Activity [Roll Forward]      
Nonvested balance at beginning of year (in shares) 479,936    
Granted (in shares) 235,280    
Vested (in shares) (212,815)    
Forfeited (in shares) (7,253)    
Nonvested balance at end of year (in shares) 495,148 479,936  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Nonvested balance at beginning of year, weighted-average grant date fair value (in dollars per share) $ 134.69    
Granted, weighted-average grant date fair value (in dollars per share) 186.54 $ 155.66 $ 130.16
Vested, weighted-average grant date fair value (in dollars per share) 132.15    
Forfeited, weighted-average grant date fair value (in dollars per share) 155.20    
Nonvested balance at end of year, weighted-average grant date fair value (in dollars per share) $ 159.74 $ 134.69  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Award vesting period 3 years    
Performance Share Awards [Member]      
Activity [Roll Forward]      
Nonvested balance at beginning of year (in shares) 782,664    
Granted (in shares) 426,777    
Vested (in shares) (522,446)    
Forfeited (in shares) (16,849)    
Nonvested balance at end of year (in shares) 670,146 782,664  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Nonvested balance at beginning of year, weighted-average grant date fair value (in dollars per share) $ 123.47    
Granted, weighted-average grant date fair value (in dollars per share) 138.99 $ 124.22 $ 107.39
Vested, weighted-average grant date fair value (in dollars per share) 110.68    
Forfeited, weighted-average grant date fair value (in dollars per share) 157.07    
Nonvested balance at end of year, weighted-average grant date fair value (in dollars per share) $ 142.42 $ 123.47  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Award vesting period 3 years    
Restricted Stock and Performance Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Total fair value of awards vested $ 125 $ 115 $ 96
Share-based Payment Arrangement, Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Award vesting period 3 years    
Maximum term 10 years