v3.24.4
Stock-Based Compensation Plans (Schedule of Restricted Stock Unit Activity) (Details) - Restricted Stock Units [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options [Roll Forward]      
Stock-based compensation, balance at beginning of period, number of units (in units) 1,938,283    
Stock-based compensation, granted, number of units (in units) 728,993    
Stock-based compensation, conversions to common stock, number of units (in units) (626,780)    
Stock-based compensation, forfeited, number of units (in units) (96,379)    
Stock-based compensation, balance at end of period, number of units (in units) 1,944,117 1,938,283  
Stock-based compensation, vested and convertible, number of units 664,962    
Stock-based compensation, weighted average remaining contractual term (in years) 10 months 6 days    
Stock-based compensation, vested and convertible, weighted average remaining contractual term (in years) 0 years    
Stock-based compensation, aggregate intrinsic value $ 219 $ 190  
Stock-based compensation, vested and convertible, aggregate intrinsic value $ 75    
Unvested stock-based compensation, balance at beginning of period, number of units (in units) [1] 1,059,683    
Unvested stock-based compensation, granted, number of units (in units) 728,993    
Unvested stock-based compensation, vested in period, number of units (in units) (534,603)    
Unvested stock-based compensation, forfeited, number of units (in units) (96,379)    
Unvested stock-based compensation, balance at end of period, number of units (in units) [1] 1,157,694 1,059,683  
Unvested stock-based compensation, balance at beginning of period, weighted-average grant-date fair value [1] $ 107.47    
Unvested stock-based compensation, granted, weighted-average grant-date fair value 104.20 $ 116.50 $ 101.47
Unvested stock-based compensation, vested in period, weighted-average grant-date fair value 103.95    
Unvested stock-based compensation, forfeited, weighted-average grant-date fair value 109.43    
Unvested stock-based compensation, balance at end of period, weighted-average grant-date fair value [1] $ 106.87 $ 107.47  
[1] Unvested RSUs represent awards where recipients have yet to satisfy either explicit vesting terms or retirement-eligibility requirements.