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Future Policy Benefits - Summary of Revenue and Interest Expense in Respect of Future Policy Benefits (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Disclosure In Tabular Form Of Revenue And Interest Expense In Respect Of Future Policy Benefits [Line Items] |  |  |  |  |  |
Gross premiums |  | $ 778 | $ 845 | $ 1,577 | $ 1,699 | $ 3,401
Interest expense | [1] | 763 | 764 | 1,529 | 1,527 | 3,060
Long-term Care Insurance |  |  |  |  |  |
Disclosure In Tabular Form Of Revenue And Interest Expense In Respect Of Future Policy Benefits [Line Items] |  |  |  |  |  |
Gross premiums |  | 613 | 671 | 1,243 | 1,346 | 2,713
Interest expense | [1] | 589 | 582 | 1,178 | 1,160 | 2,333
Life Insurance |  |  |  |  |  |
Disclosure In Tabular Form Of Revenue And Interest Expense In Respect Of Future Policy Benefits [Line Items] |  |  |  |  |  |
Gross premiums |  | 165 | 174 | 334 | 353 | 688
Interest expense | [1] | 14 | 16 | 29 | 33 | 64
Fixed annuities |  |  |  |  |  |
Disclosure In Tabular Form Of Revenue And Interest Expense In Respect Of Future Policy Benefits [Line Items] |  |  |  |  |  |
Gross premiums |  | 0 | 0 | 0 | 0 | 0
Interest expense | [1] | $ 160 | $ 166 | $ 322 | $ 334 | $ 663
[1] | Amounts for interest accretion are included in benefits and other changes in policy reserves in the condensed consolidated statements of income.

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