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Investments - Schedule of Residential Mortgage Loans with Credit Quality Indicators, Performing or Nonperforming (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Allowance for credit loss	$ (60)	$ (42)	$ (32)	$ (31)
Total mortgage loans	4,984	4,554
Residential mortgage loans
Schedule of Investments [Line Items]
Amortized Cost	$ 2,574	$ 2,180
% of Total	100.00%	100.00%
Allowance for credit loss	$ (48)	$ (32)	$ (26)	$ (25)
Allowance for expected credit loss, % of Total	0.00%	0.00%
Total mortgage loans	$ 2,526	$ 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	$ 2,511	$ 2,118
% of Total	98.00%	97.00%
Nonperforming Financial Instruments | Residential mortgage loans
Schedule of Investments [Line Items]
Amortized Cost	$ 63	$ 62
% of Total	2.00%	3.00%

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Financing Receivable Allowance for Expected Credit Loss, Percent

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Percentage of allowance for credit loss to total financing receivable outstanding.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
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-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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