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, 2024	Dec. 31, 2024	Dec. 31, 2023
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	$ 17	$ 12
Credit losses on securities for which credit losses were not previously recorded		24	11
Reductions for securities sold during the period		(1)	(5)
Increase (decrease) on securities with allowance recorded in previous period		(2)	(1)
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance		38	17
U.S. corporate public 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	0	0
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance		0	0
Residential 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	0	0
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance		0	0
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	9	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
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance		17	9
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	3	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)
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance		2	3
Foreign 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	2	2	2
Credit losses on securities for which credit losses were not previously recorded		8	0
Reductions for securities sold during the period		0	0
Increase (decrease) on securities with allowance recorded in previous period		(1)	0
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance		9	2
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	3	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		0	0
Allowance for credit losses on available-for-sale fixed maturity securities, ending balance		4	3
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	0	0	0
Credit losses on securities for which credit losses were not previously recorded	0	6
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		$ 6	$ 0

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

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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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+ References

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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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