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Net Investment Income (Schedule of Net Investment Income) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Total investment income $ 218 $ 225 $ 320
Deposits and other investments 47 69 123
Deferred compensation plan assets 19 13 17
Equity in earnings of affiliates, net 7 6 3
Other 1 0 2
Investment expenses (3) (4) (4)
Net investment income 215 221 316
Debt Securities      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Total investment income 133 126 163
Equity Securities      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Total investment income $ 11 $ 11 $ 12