Investments (excluding Consolidated Investment Entities) - Allowance for Credit Losses on Available-for-sale fixed maturity securities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses on available-for-sale fixed maturity securities, beginning balance	$ 38	$ 17
Credit losses on securities for which credit losses were not previously recorded	12	24
Reductions for securities sold during the period	(23)	(1)
Increase (decrease) on securities with allowance recorded in previous period	(1)	(2)
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance	26	38
U.S. corporate private securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses on available-for-sale fixed maturity securities, beginning balance	6	0
Credit losses on securities for which credit losses were not previously recorded	9	6
Reductions for securities sold during the period	(6)	0
Increase (decrease) on securities with allowance recorded in previous period	0	0
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance	9	6
Commercial mortgage-backed securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses on available-for-sale fixed maturity securities, 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)
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance	0	17
Foreign Corporate Public Securities and Foreign Governments [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses on available-for-sale fixed maturity securities, 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
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance	2	2
Foreign corporate private securities(1)
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses on available-for-sale fixed maturity securities, beginning balance	9	2
Credit losses on securities for which credit losses were not previously recorded	0	8
Reductions for securities sold during the period	0	0
Increase (decrease) on securities with allowance recorded in previous period	(1)	(1)
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance	8	9
Other asset-backed securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses on available-for-sale fixed maturity securities, beginning balance	4	3
Credit losses on securities for which credit losses were not previously recorded	3	1
Reductions for securities sold during the period	0	0
Increase (decrease) on securities with allowance recorded in previous period	0	0
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance	$ 7	$ 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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- 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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+ 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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