Investments (excluding Consolidated Investment Entities) - Allowance for Credit Losses on Available-for-sale Fixed Maturity Securities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2025	Dec. 31, 2024
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 38	$ 17
Credit losses on securities for which credit losses were not previously recorded	37	24
Reductions for securities sold during the period	(23)	(1)
Increase (decrease) on securities with allowance recorded in previous period	0	(2)
Ending Balance	52	38
U.S. corporate private securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	6	0
Credit losses on securities for which credit losses were not previously recorded	2	6
Reductions for securities sold during the period	(6)	0
Increase (decrease) on securities with allowance recorded in previous period	0	0
Ending Balance	2	6
Commercial mortgage-backed securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	17	9
Credit losses on securities for which credit losses were not previously recorded	0	9
Reductions for securities sold during the period	(17)	0
Increase (decrease) on securities with allowance recorded in previous period	0	(1)
Ending Balance	0	17
Foreign corporate public securities and foreign governments
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	2	3
Credit losses on securities for which credit losses were not previously recorded	0	0
Reductions for securities sold during the period	0	(1)
Increase (decrease) on securities with allowance recorded in previous period	0	0
Ending Balance	2	2
Foreign corporate private securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	9	2
Credit losses on securities for which credit losses were not previously recorded	33	8
Reductions for securities sold during the period	0	0
Increase (decrease) on securities with allowance recorded in previous period	0	(1)
Ending Balance	42	9
Other asset-backed securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	4	3
Credit losses on securities for which credit losses were not previously recorded	2	1
Reductions for securities sold during the period	0	0
Increase (decrease) on securities with allowance recorded in previous period	0	0
Ending Balance	$ 6	$ 4

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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with previously recorded allowance and not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis.

+ 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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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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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