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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, 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

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