Investments - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Unfunded commitments to limited partnerships	$ 418	$ 396
Percentage (based on unrealized loss) of available for sale fixed maturities that are in unrealized loss position and rated investment grade	94.00%
Percentage (based on fair value) of available for sale fixed maturities that are in unrealized loss position and rated investment grade	95.00%
Multifamily
Schedule of Investments [Line Items]
Percent of real estate-related investments by property type	92.00%	92.00%
Fixed maturities
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale fixed maturities	$ (470)	$ (669)
Number of fixed maturities in an unrealized loss position | security	1,450,000,000