Investments (ACL for Fixed Maturity Securities AFS By Sector) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	$ 184	$ 183
ACL not previously recorded	0	36
Changes for securities with previously recorded ACL	0	(10)
Securities sold or exchanged	(71)	(16)
Allowance, end of period	113	193
U.S. corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	68	29
ACL not previously recorded	0	36
Changes for securities with previously recorded ACL	0	0
Securities sold or exchanged	(53)	(2)
Allowance, end of period	15	63
Foreign corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	2	5
ACL not previously recorded	0	0
Changes for securities with previously recorded ACL	0	0
Securities sold or exchanged	0	(3)
Allowance, end of period	2	2
Foreign government
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	88	130
ACL not previously recorded	0	0
Changes for securities with previously recorded ACL	(4)	(13)
Securities sold or exchanged	(18)	0
Allowance, end of period	66	117
RMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	1	0
ACL not previously recorded	0	0
Changes for securities with previously recorded ACL	0	0
Securities sold or exchanged	0	0
Allowance, end of period	1	0
ABS & CLO
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	7	0
ACL not previously recorded	0	0
Changes for securities with previously recorded ACL	2	0
Securities sold or exchanged	0	0
Allowance, end of period	9	0
CMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Allowance, beginning of period	18	19
ACL not previously recorded	0	0
Changes for securities with previously recorded ACL	2	3
Securities sold or exchanged	0	(11)
Allowance, end of period	$ 20	$ 11

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
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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