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Share-Based Compensation (Summary of RSU Activity) (Detail) - RSUs - RSUs - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
RSU, Shares      
Unvested at December 31, 2020 0.9    
Granted during 2021 0.9    
Vested during 2021 (0.9)    
Unvested at December 31, 2021 0.9 0.9  
RSU, Weighted-average grant-date fair value      
Unvested at December 31, 2020 $ 57.24    
Granted during 2021 56.65 $ 63.14 $ 51.46
Vested during 2021 55.78    
Unvested at December 31, 2021 $ 58.11 $ 57.24