Investments - Investments - ACL on Fixed Maturities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Beginning Balance	$ (1)	$ (23)	$ 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	20	2	39
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	(4)	(18)	(7)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery	(3)	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	1	(6)	(9)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff	3	0	0
Ending Balance	(12)	(1)	(23)
CMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Beginning Balance	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	7
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	3
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff	0
Ending Balance	(10)	0
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Beginning Balance	(1)	(23)	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	10	2	36
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	(3)	(18)	(4)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	(3)	(6)	(9)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff	3	0	0
Ending Balance	(2)	(1)	(23)
Municipal
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Beginning Balance	0	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded			3
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold			(3)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery			0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)			0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff			0
Ending Balance	0	0	$ 0
Debt Security, Government, Non-US [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Beginning Balance	0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded	3
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold	(1)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Sell before Recovery	(3)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease)	1
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff	0
Ending Balance	$ 0	$ 0

Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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