Investments - Loans by Loan to Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Schedule of Loans by Loan to Value Ratio [Line Items]
Targeted maximum amount of mortgage loans lended, percent of estimated fair value of underlying real estate	75.00%
Benchmark loan to value ratio, greater than indicates unpaid loan amount exceeds underlying collateral	100.00%
Benchmark debt service coverage ratio, less than indicates property's operations income is less than debt payments	100.00%
Mortgage loans, before Allowance for Credit Loss	$ 3,632	$ 4,048
0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	0.00%	0.00%
Loan to Value Ratio, maximum	50.00%	50.00%
Mortgage loans, before Allowance for Credit Loss	$ 2,553	$ 2,707
>50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	50.00%	50.00%
Loan to Value Ratio, maximum	60.00%	60.00%
Mortgage loans, before Allowance for Credit Loss	$ 835	$ 1,008
>60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	60.00%	60.00%
Loan to Value Ratio, maximum	70.00%	70.00%
Mortgage loans, before Allowance for Credit Loss	$ 228	$ 293
>70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	70.00%	70.00%
Loan to Value Ratio, maximum	80.00%	80.00%
Mortgage loans, before Allowance for Credit Loss	$ 0	$ 10
>80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	80.00%	80.00%
Mortgage loans, before Allowance for Credit Loss	$ 16	$ 30
Year of Origination 2021
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	535	570
Year of Origination 2021 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	201	215
Year of Origination 2021 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	240	282
Year of Origination 2021 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	94	73
Year of Origination 2021 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2021 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2020
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	430	569
Year of Origination 2020 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	189	191
Year of Origination 2020 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	148	181
Year of Origination 2020 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	93	197
Year of Origination 2020 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2020 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2019
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	212	251
Year of Origination 2019 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	149	137
Year of Origination 2019 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	63	93
Year of Origination 2019 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2019 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	10
Year of Origination 2019 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	11
Year of Origination 2018
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	1,970	247
Year of Origination 2018 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	1,827	173
Year of Origination 2018 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	126	54
Year of Origination 2018 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	1	20
Year of Origination 2018 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2018 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	16	0
Year of Origination 2017
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss		2,146
Year of Origination 2017 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss		1,878
Year of Origination 2017 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss		246
Year of Origination 2017 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss		3
Year of Origination 2017 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss		0
Year of Origination 2017 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss		19
Year of Origination 2023
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	229	265
Year of Origination 2023 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	111
Year of Origination 2023 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	107
Year of Origination 2023 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	11
Year of Origination 2023 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0
Year of Origination 2023 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0
Year of Origination 2022
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	256	265
Year of Origination 2022 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	76	113
Year of Origination 2022 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	151	152
Year of Origination 2022 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	29	0
Year of Origination 2022 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2022 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	$ 0	$ 0