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Investments - Schedule of Residential Mortgage Loans with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Allowance for credit loss	$ (64)	$ (60)	$ (42)	$ (35)	$ (32)	$ (31)
Total mortgage loans	5,076		4,554
Residential mortgage loans
Schedule of Investments [Line Items]
Amortized Cost	$ 2,670		$ 2,180
% of Total	100.00%		100.00%
Allowance for credit loss	$ (51)	$ (48)	$ (32)	$ (29)	$ (26)	$ (25)
Allowance for expected credit loss, % of Total	0.00%		0.00%
Total mortgage loans	$ 2,619		$ 2,148
Total residential mortgage loans, net of valuation allowance, % of Total	100.00%		100.00%
Performing Financial Instruments | Residential mortgage loans
Schedule of Investments [Line Items]
Amortized Cost	$ 2,598		$ 2,118
% of Total	97.00%		97.00%
Nonperforming Financial Instruments | Residential mortgage loans
Schedule of Investments [Line Items]
Amortized Cost	$ 72		$ 62
% of Total	3.00%		3.00%

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