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Equity (Restricted Stock, Performance Share Awards and Options) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted Stock Awards [Member]      
Activity [Roll Forward]      
Nonvested balance at beginning of year (in shares) 1,674,242    
Granted (in shares) 1,013,039    
Vested (in shares) (835,919)    
Forfeited (in shares) (33,630)    
Nonvested balance at end of year (in shares) 1,817,732 1,674,242  
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) $ 50.26    
Granted, weighted-average grant date fair value (in dollars per share) 82.69 $ 68.25 $ 46.64
Vested, weighted-average grant date fair value (in dollars per share) 48.06    
Forfeited, weighted-average grant date fair value (in dollars per share) 69.63    
Nonvested balance at end of year, weighted-average grant date fair value (in dollars per share) $ 68.09 $ 50.26  
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) 1,938,608    
Granted (in shares) 1,297,680    
Vested (in shares) (1,738,904)    
Forfeited (in shares) (85,235)    
Nonvested balance at end of year (in shares) 1,412,149 1,938,608  
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) $ 47.46    
Granted, weighted-average grant date fair value (in dollars per share) 54.82 $ 46.09 $ 34.75
Vested, weighted-average grant date fair value (in dollars per share) 37.53    
Forfeited, weighted-average grant date fair value (in dollars per share) 64.84    
Nonvested balance at end of year, weighted-average grant date fair value (in dollars per share) $ 61.22 $ 47.46  
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 $ 186 $ 177 $ 125
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