Investments - ACL on Mortgage Loans (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			$ 12
Ending balance	$ 12	$ 11	15
Commercial loan
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0	17	12	$ 0
Change in ACL on mortgage loans	0	(6)	3	8
Ending balance	12		15	17
Cumulative effect of accounting changes, net of tax \| Accounting Standards Update 2016-13 \| Commercial loan
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12			9
Adjusted balance \| Commercial loan
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12	$ 17	$ 12	9
Ending balance	$ 12			$ 17

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

Reference 1: 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

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- Definition

Amount of increase (decrease) in allowance for credit loss on financing receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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