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Employee Benefits - Certain Information Regarding Health and Welfare Plan (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Change in Plan Assets:    
Fair value of assets at end of year $ 228  
Post-Retirement Benefits    
Change in benefit obligation:    
Benefit obligation at beginning of year 10 $ 12
Actuarial gain (2) (2)
Premiums and claims paid (1)  
Benefit obligation at end of year 7 10
Change in Plan Assets:    
Employer contribution 1  
Premiums and claims paid (1)  
Funded status (included in “Other liabilities”) (7) (10)
Changes recognized in other comprehensive income for the year ended December 31:    
Net actuarial (gain) loss arising during the year 2 2
Total recognized in other comprehensive income for the year (pre-tax) 2 $ 2
Accumulated other comprehensive (gain) loss (pre-tax) not yet recognized in net periodic benefit cost at December 31:    
Actuarial (gain) loss, net (2)  
Total accumulated other comprehensive loss (pre-tax) $ (2)