Investments - Schedule of Principal Geographic Distribution of Commercial Real Estate Exceeding 5% of the Mortgage Loans Portfolio and Types of Properties Collateralizing, Portfolio and Contractual Maturities (Details) $ in Millions	Dec. 31, 2024 USD ($) loan	Dec. 31, 2023 USD ($)
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	100.00%	100.00%
Amortized cost, net	$ 784	$ 822
Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	100.00%
Number of loans | loan	51
Amortized cost, net	$ 723
2025 | Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	7.70%
Number of loans | loan	5
Amortized cost, net	$ 56
2026 | Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	20.90%
Number of loans | loan	10
Amortized cost, net	$ 151
2027 | Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	7.10%
Number of loans | loan	5
Amortized cost, net	$ 51
2028 | Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	26.10%
Number of loans | loan	13
Amortized cost, net	$ 189
Thereafter | Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	38.20%
Number of loans | loan	18
Amortized cost, net	$ 276
Apartment complex
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	26.60%	30.60%
Retail
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	22.70%	25.00%
Warehouse
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	22.40%	20.00%
Office
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	15.40%	15.20%
Other
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	12.90%	9.20%
California
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	22.90%	21.90%
Texas
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	13.80%	17.90%
Florida
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	8.50%	7.50%
Washington
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	3.20%	5.80%
Tennessee
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	6.20%	5.60%
Virginia
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	6.10%	1.20%
Ohio
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (as a percent)	5.40%	5.00%