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Net Investment Income (Schedule of Net Investment Income) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |
Total investment income | $ 343 | $ 218 | $ 225
Deposits and other investments | 135 | 47 | 69
Deferred compensation plan assets | (25) | 19 | 13
Equity in earnings of affiliates, net | 11 | 7 | 6
Other | 7 | 1 | 0
Investment expenses | (3) | (3) | (4)
Net investment income | 340 | 215 | 221
Debt Securities |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |
Total investment income | 206 | 133 | 126
Equity Securities |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |
Total investment income | $ 9 | $ 11 | $ 11

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