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Share-Based Incentive Compensation (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 08, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted stock units, deferred stock units and performance share awards [Member]        
Share-based compensation        
Fair value of shares that vested during the year   $ 124 $ 127 $ 130
Restricted stock units, deferred stock units and performance share awards [Member] | Subsequent event [Member]        
Summary of other equity instruments [Roll Forward]        
Other equity instruments, granted, number (in shares) 788,058      
Other equity instruments, granted, weighted average grant-date fair value (in dollars per share) $ 172.50      
Restricted and deferred stock units [Member]        
Summary of other equity instruments [Roll Forward]        
Other equity instruments, nonvested, number, beginning of year (in shares)   1,086,784    
Other equity instruments, granted, number (in shares)   605,188    
Other equity instruments, vested, number (in shares)   (513,226)    
Other equity instruments, forfeited, number (in shares)   (69,921)    
Other equity instruments, nonvested, number, end of year (in shares)   1,108,825 1,086,784  
Other equity instruments, nonvested, weighted average grant-date fair value, beginning of year (in dollars per share)   $ 132.12    
Other equity instruments, granted, weighted average grant-date fair value (in dollars per share)   141.22    
Other equity instruments, vested, weighted average grant-date fair value (in dollars per share)   138.57    
Other equity instruments, forfeited, weighted average grant-date fair value (in dollars per share)   132.93    
Other equity instruments, nonvested, weighted average grant-date fair value, end of year (in dollars per share)   $ 134.05 $ 132.12  
Other equity instruments, nonvested dividend equivalents, number, beginning of year (in shares)   394    
Other equity instruments, nonvested dividend equivalents, number, end of year (in shares)   280 394  
Restricted and deferred stock units [Member] | Subsequent event [Member]        
Summary of other equity instruments [Roll Forward]        
Other equity instruments, granted, number (in shares) 470,716      
Restricted stock units [Member]        
Share-based compensation        
Award vesting period   3 years    
Performance shares [Member]        
Share-based compensation        
Performance period   3 years    
Award vesting period   3 years    
Percentage of performance shares to vest if minimum performance threshold is not met   0.00%    
Summary of other equity instruments [Roll Forward]        
Other equity instruments, nonvested, number, beginning of year (in shares)   723,991    
Other equity instruments, granted, number (in shares)   367,299    
Other equity instruments, vested, number (in shares)   (359,925)    
Other equity instruments, forfeited, number (in shares)   (24,828)    
Other equity instruments, performance-based adjustment, number (in shares)   224,020    
Other equity instruments, nonvested, number, end of year (in shares)   930,557 723,991  
Other equity instruments, nonvested, weighted average grant-date fair value, beginning of year (in dollars per share)   $ 129.45    
Other equity instruments, granted, weighted average grant-date fair value (in dollars per share)   139.83    
Other equity instruments, vested, weighted average grant-date fair value (in dollars per share)   126.18    
Other equity instruments, forfeited, weighted average grant-date fair value (in dollars per share)   131.20    
Other equity instruments, performance-based adjustment, weighted average grant-date fair value (in dollars per share)   138.56    
Other equity instruments, nonvested, weighted average grant-date fair value, end of year (in dollars per share)   $ 136.96 $ 129.45  
Other equity instruments, nonvested dividend equivalents, number, beginning of year (in shares)   29,751    
Other equity instruments, nonvested dividend equivalents, number, end of year (in shares)   32,670 29,751  
Performance shares [Member] | Subsequent event [Member]        
Summary of other equity instruments [Roll Forward]        
Other equity instruments, granted, number (in shares) 317,342      
Performance shares [Member] | February 2020 Awards [Member] | Minimum [Member]        
Share-based compensation        
Percentage of performance shares to vest if minimum performance threshold is met or exceeded   50.00%    
Performance shares [Member] | February 2020 Awards [Member] | Maximum [Member]        
Share-based compensation        
Percentage of performance shares to vest if minimum performance threshold is met or exceeded   150.00%    
Performance shares [Member] | February 2021 and 2022 Awards [Member] | Minimum [Member]        
Share-based compensation        
Percentage of performance shares to vest if minimum performance threshold is met or exceeded   50.00%    
Performance shares [Member] | February 2021 and 2022 Awards [Member] | Maximum [Member]        
Share-based compensation        
Percentage of performance shares to vest if minimum performance threshold is met or exceeded   200.00%