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Summary of Aggregate Fair Value of Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
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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