Investments (ACL for Fixed Maturity Securities AFS By Sector) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	$ 91	$ 81
ACL not previously recorded	287	28
Changes for securities with previously recorded ACL	7	(5)
Securities sold or exchanged	(8)	0
Write-offs	(22)	0
Allowance, end of period	355	104
U.S. corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	30	44
ACL not previously recorded	13	0
Changes for securities with previously recorded ACL	0	(1)
Securities sold or exchanged	(8)	0
Write-offs	(22)	0
Allowance, end of period	13	43
Foreign corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	28	16
ACL not previously recorded	67	21
Changes for securities with previously recorded ACL	7	(4)
Securities sold or exchanged	0	0
Write-offs	0	0
Allowance, end of period	102	33
Foreign government
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	19	21
ACL not previously recorded	207	0
Changes for securities with previously recorded ACL	0	0
Securities sold or exchanged	0	0
Write-offs	0	0
Allowance, end of period	226	21
CMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	14	0
ACL not previously recorded	0	7
Changes for securities with previously recorded ACL	0	0
Securities sold or exchanged	0	0
Write-offs	0	0
Allowance, end of period	$ 14	$ 7

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 http://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 http://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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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