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Summary of Aggregate Fair Value of Assets (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate Account Assets | $ 4,553 | $ 4,509
Equity funds |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate Account Assets | 2,112 | 2,018
Balanced funds |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate Account Assets | 1,900 | 1,927
Bond funds |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate Account Assets | 307 | 320
Money market funds |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate Account Assets | $ 234 | $ 244

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