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Investments - Distribution of Residential Mortgage Loans by State (Details) - Residential mortgage loans - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Amortized Cost	$ 2,574	$ 2,180
% of Total	100.00%	100.00%
Florida
Schedule of Investments [Line Items]
Amortized Cost	$ 236	$ 324
% of Total	9.00%	15.00%
Texas
Schedule of Investments [Line Items]
Amortized Cost	$ 181	$ 215
% of Total	7.00%	10.00%
New Jersey
Schedule of Investments [Line Items]
Amortized Cost	$ 167	$ 172
% of Total	6.00%	8.00%
Pennsylvania
Schedule of Investments [Line Items]
Amortized Cost		$ 153
% of Total		7.00%
California
Schedule of Investments [Line Items]
Amortized Cost	$ 157	$ 139
% of Total	6.00%	6.00%
NEW YORK
Schedule of Investments [Line Items]
Amortized Cost	$ 155	$ 138
% of Total	6.00%	6.00%
Georgia
Schedule of Investments [Line Items]
Amortized Cost		$ 125
% of Total		6.00%
All other states
Schedule of Investments [Line Items]
Amortized Cost	$ 1,678	$ 914
% of Total	66.00%	42.00%

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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