Investments (excluding Consolidated Investment Entities) - Allowance for Credit Losses on Available-for-sale Fixed Maturity Securities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
Mar. 31, 2024	Sep. 30, 2023	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 17	$ 12	$ 12
Credit losses on securities for which credit losses were not previously recorded	6	11
Reductions for securities sold during the period	(1)	(5)
Increase (decrease) on securities with allowance recorded in previous period	0	(1)
Ending Balance	22		17
U.S. corporate public securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0	0	0
Credit losses on securities for which credit losses were not previously recorded	0		0
Reductions for securities sold during the period	0		0
Increase (decrease) on securities with allowance recorded in previous period	0		0
Ending Balance	0		0
Residential mortgage-backed
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0
Ending Balance	0		0
Commercial mortgage-backed securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	9	0	0
Credit losses on securities for which credit losses were not previously recorded	5		9
Reductions for securities sold during the period	0		0
Increase (decrease) on securities with allowance recorded in previous period	0		0
Ending Balance	14		9
Foreign corporate public securities and foreign governments
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3	9	9
Credit losses on securities for which credit losses were not previously recorded	0	0
Reductions for securities sold during the period	(1)	(5)
Increase (decrease) on securities with allowance recorded in previous period	0	(1)
Ending Balance	2		3
Foreign corporate private securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2	2	2
Credit losses on securities for which credit losses were not previously recorded	0	0
Reductions for securities sold during the period	0	0
Increase (decrease) on securities with allowance recorded in previous period	(1)	0
Ending Balance	1		2
Other asset-backed securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3	1	1
Credit losses on securities for which credit losses were not previously recorded	1	2
Reductions for securities sold during the period	0	0
Increase (decrease) on securities with allowance recorded in previous period	1	$ 0
Ending Balance	$ 5		$ 3

Amount excluding accrued interest, 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 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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Amount, excluding accrued interest, of credit loss expense on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with no credit loss previously recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

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Amount, excluding accrued interest, of decrease in 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) from sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

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