Investments (excluding Consolidated Investment Entities) - Allowance for Credit Losses on Available-for-sale Fixed Maturity Securities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 26	$ 38
Credit losses on securities for which credit losses were not previously recorded	3	12
Reductions for securities sold during the period	0	(23)
Increase (decrease) on securities with allowance recorded in previous period	4	(1)
Ending Balance	33	26
U.S. corporate private securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	9	6
Credit losses on securities for which credit losses were not previously recorded	0	9
Reductions for securities sold during the period	0	(6)
Increase (decrease) on securities with allowance recorded in previous period	2	0
Ending Balance	11	9
Commercial mortgage-backed securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	0	17
Credit losses on securities for which credit losses were not previously recorded	0	0
Reductions for securities sold during the period	0	(17)
Increase (decrease) on securities with allowance recorded in previous period	0	0
Ending Balance	0	0
Foreign corporate public securities and foreign governments
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	0	0
Ending Balance	2	2
Foreign corporate private securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	8	9
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	(1)
Ending Balance	8	8
Other asset-backed securities
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	7	4
Credit losses on securities for which credit losses were not previously recorded	3	3
Reductions for securities sold during the period	0	0
Increase (decrease) on securities with allowance recorded in previous period	2	0
Ending Balance	$ 12	$ 7

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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- Definition

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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