Investments (excluding Consolidated Investment Entities) - Allowance for Credit Losses on Available-for-sale Fixed Maturity Securities (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2024	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 17	$ 12
Credit losses on securities for which credit losses were not previously recorded	16	11
Reductions for securities sold during the period	(1)	(5)
Increase (decrease) on securities with allowance recorded in previous period	0	(1)
Ending Balance	32	17
U.S. corporate private securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0	0
Credit losses on securities for which credit losses were not previously recorded	6	0
Reductions for securities sold during the period	0	0
Increase (decrease) on securities with allowance recorded in previous period	0	0
Ending Balance	6	0
Commercial mortgage-backed securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	9	0
Credit losses on securities for which credit losses were not previously recorded	9	9
Reductions for securities sold during the period	0	0
Increase (decrease) on securities with allowance recorded in previous period	(1)	0
Ending Balance	17	9
Foreign corporate public securities and foreign governments
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	3	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
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
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	2	0
Ending Balance	$ 6	$ 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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+ 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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