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Equity (Restricted Stock, Performance Share Awards and Options) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock Awards [Member]      
Activity [Roll Forward]      
Nonvested balance at beginning of year (in shares) 511,313    
Granted (in shares) 209,983    
Vested (in shares) (238,554)    
Forfeited (in shares) (2,806)    
Nonvested balance at end of year (in shares) 479,936 511,313  
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) $ 116.36    
Granted, weighted-average grant date fair value (in dollars per share) 155.66 $ 130.16 $ 112.86
Vested, weighted-average grant date fair value (in dollars per share) 113.84    
Forfeited, weighted-average grant date fair value (in dollars per share) 136.19    
Nonvested balance at end of year, weighted-average grant date fair value (in dollars per share) $ 134.69 $ 116.36  
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) 808,408    
Granted (in shares) 460,252    
Vested (in shares) (468,571)    
Forfeited (in shares) (17,425)    
Nonvested balance at end of year (in shares) 782,664 808,408  
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) $ 110.98    
Granted, weighted-average grant date fair value (in dollars per share) 124.22 $ 107.39 $ 89.23
Vested, weighted-average grant date fair value (in dollars per share) 96.70    
Forfeited, weighted-average grant date fair value (in dollars per share) 115.37    
Nonvested balance at end of year, weighted-average grant date fair value (in dollars per share) $ 123.47 $ 110.98  
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 $ 115 $ 96 $ 99
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Award vesting period 3 years    
Maximum term 10 years