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Equity (Assumptions and Options) (Details) - Share-based Payment Arrangement, Option [Member] - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assumptions used to estimate the fair value of options using the Black-Scholes option pricing model [Abstract]      
Expected term (years) 7 years 7 years 7 years
Option activity [Roll Forward]      
Shares underlying options - Balance at beginning of year (in shares) 9,618,204    
Shares underlying options - Granted (in shares) 1,220,265    
Shares underlying options - Exercised (in shares) (738,516)    
Shares underlying options - forfeited (in shares) 86,641    
Shares underlying options - Balance at end of year (in shares) 10,013,312 9,618,204  
Shares underlying options - Exercisable (in shares) 7,235,572    
Additional disclosures pertaining to options [Abstract]      
Balance at beginning of year, weighted average exercise price (in dollars per share) $ 38.32    
Granted, weighted average exercise price (in dollars per share) 83.33    
Exercised, weighted average exercise price (in dollars per share) 20.08    
Forfeited, weighted average exercise price (in dollars per share) 71.19    
Balance at end of year, weighted average exercise price (in dollars per share) 44.87 $ 38.32  
Exercisable at end of year, weighted average exercise price (in dollars per share) $ 35.35    
Balance at end of year, weighted average remaining contractual term (years) 6 years    
Exercisable at end of year, weighted average remaining contractual term (years) 5 years    
Balance at end of year, aggregate intrinsic value $ 486    
Exercisable at end of year, aggregate intrinsic value $ 420    
Granted, weighted average grant date fair value (in dollars per share) $ 9.82 $ 7.08 $ 5.01
Total intrinsic value of stock options exercised $ 49,000,000 $ 71,000,000 $ 81,000,000
Cash received from option exercises 15,000,000 30,000,000 34,000,000
Tax benefit realized from options exercised $ 11,000,000 $ 17,000,000 $ 19,000,000
Minimum [Member]      
Assumptions used to estimate the fair value of options using the Black-Scholes option pricing model [Abstract]      
Expected volatility (in hundredths) 17.32% 14.63% 14.20%
Expected dividends (in hundredths) 2.30% 2.50% 2.85%
Risk-free rate (in hundredths) 0.80% 0.49% 2.24%
Maximum [Member]      
Assumptions used to estimate the fair value of options using the Black-Scholes option pricing model [Abstract]      
Expected volatility (in hundredths) 17.75% 16.31% 14.31%
Expected dividends (in hundredths) 2.44% 2.72% 2.93%
Risk-free rate (in hundredths) 1.27% 1.52% 2.54%