Investments - Principal geographic distribution of commercial real estate exceeding 5% of the mortgage loans portfolio (Details) $ in Millions	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($)
Schedule of Available for Sale Securities
Number of loans | loan	51
Amortized cost, net | $	$ 762	$ 821
Mortgage loans on real estate, carrying value (percentage)	100.00%	100.00%
2023 | Mortgage loans
Schedule of Available for Sale Securities
Number of loans | loan	6
Amortized cost, net | $	$ 61
Mortgage loans on real estate, carrying value (percentage)	8.00%
2024 | Mortgage loans
Schedule of Available for Sale Securities
Number of loans | loan	5
Amortized cost, net | $	$ 89
Mortgage loans on real estate, carrying value (percentage)	11.70%
2025 | Mortgage loans
Schedule of Available for Sale Securities
Number of loans | loan	7
Amortized cost, net | $	$ 85
Mortgage loans on real estate, carrying value (percentage)	11.20%
2026 | Mortgage loans
Schedule of Available for Sale Securities
Number of loans | loan	5
Amortized cost, net | $	$ 100
Mortgage loans on real estate, carrying value (percentage)	13.10%
Thereafter | Mortgage loans
Schedule of Available for Sale Securities
Number of loans | loan	28
Amortized cost, net | $	$ 427
Mortgage loans on real estate, carrying value (percentage)	56.00%
Apartment complex
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	30.20%	35.30%
Retail
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	27.40%	23.80%
Office
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	17.50%	18.50%
Warehouse
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	16.00%	11.00%
Other
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	8.90%	11.40%
California
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	24.90%	19.60%
Texas
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	16.30%	20.40%
Washington
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	7.30%	4.30%
Florida
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	6.40%	6.00%
Tennessee
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	6.10%	5.70%
Ohio
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	5.60%	5.30%
Massachusetts
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	2.60%	5.70%
Illinois
Schedule of Available for Sale Securities
Mortgage loans on real estate, carrying value (percentage)	2.40%	6.70%