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, 2023 USD ($) loan	Dec. 31, 2022 USD ($)
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	100.00%	100.00%
Number of loans | loan	57
Amortized cost, net | $	$ 822	$ 762
2024 | Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	10.70%
Number of loans | loan	5
Amortized cost, net | $	$ 88
2025 | Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	8.50%
Number of loans | loan	6
Amortized cost, net | $	$ 70
2026 | Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	20.20%
Number of loans | loan	11
Amortized cost, net | $	$ 166
2027 | Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	7.10%
Number of loans | loan	6
Amortized cost, net | $	$ 58
Thereafter | Mortgage loans
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	53.50%
Number of loans | loan	29
Amortized cost, net | $	$ 440
Apartment complex
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	30.60%	30.20%
Retail
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	25.00%	27.40%
Warehouse
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	20.00%	16.00%
Office
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	15.20%	17.50%
Other
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	9.20%	8.90%
California
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	21.90%	24.90%
Texas
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	17.90%	16.30%
Florida
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	7.50%	6.40%
Washington
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	5.80%	7.30%
Tennessee
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	5.60%	6.10%
Ohio
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	5.00%	5.60%