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Investments - Distribution of Residential Mortgage Loans by State (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Allowance for credit loss	$ (67)	$ (66)	$ (60)	$ (42)
Total mortgage loans	5,440	5,336
Residential mortgage loans
Schedule of Investments [Line Items]
Amortized Cost	$ 2,944	$ 2,852
% of Total	100.00%	100.00%
Allowance for credit loss	$ (54)	$ (54)	$ (48)	$ (32)
Total mortgage loans	2,890	2,798
Florida | Residential mortgage loans
Schedule of Investments [Line Items]
Amortized Cost	$ 164	$ 163
% of Total	5.00%	6.00%
California | Residential mortgage loans
Schedule of Investments [Line Items]
Amortized Cost	$ 142	$ 129
% of Total	5.00%	5.00%
Texas | Residential mortgage loans
Schedule of Investments [Line Items]
Amortized Cost		$ 129
% of Total		5.00%
All other states | Residential mortgage loans
Schedule of Investments [Line Items]
Amortized Cost	$ 2,638	$ 2,431
% of Total	90.00%	84.00%

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Percentage, before allowance for credit loss, of financing receivable to total financing receivable.

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