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Investments - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Percentage of investment portfolio by which no other industry group exceeded	10.00%
Percentage of stockholders' equity by which no single issuer of fixed maturity securities exceeded	10
Commercial mortgage loans on nonaccrual status	$ 0	$ 0
Commercial mortgage loans, amortized cost	$ 6,692	6,829
Finance and insurance | Fixed maturity securities
Schedule of Investments [Line Items]
Percent of investment portfolio, greater than 10%	27.00%
Utilities | Fixed maturity securities
Schedule of Investments [Line Items]
Percent of investment portfolio, greater than 10%	14.00%
Consumer-non-cyclical | Fixed maturity securities
Schedule of Investments [Line Items]
Percent of investment portfolio, greater than 10%	14.00%
Technology and Communications | Fixed maturity securities
Schedule of Investments [Line Items]
Percent of investment portfolio, greater than 10%	10.00%
Industrial
Schedule of Investments [Line Items]
Commercial mortgage loans, amortized cost	$ 1,400	$ 1,440
Industrial | Commercial mortgage loans | 61 to 90 Days Past Due
Schedule of Investments [Line Items]
Commercial mortgage loans, amortized cost	$ 11

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