Investments - Allowance for credit losses (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	$ 11	$ 30	$ 14
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	1	18
Reductions for securities sold during the period	(20)	(2)
Residential mortgage-backed
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Commercial mortgage-backed
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	17	9
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	0	8
Reductions for securities sold during the period	(17)	0
Foreign corporate public securities and foreign governments
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	1	1	3
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	0	0
Reductions for securities sold during the period	0	(2)
Foreign corporate private securities
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	8	8	1
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	0	7
Reductions for securities sold during the period	0	0
U.S. corporate private securities
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	1	3
Financing Receivable, Allowance for Credit Loss	1	3	0
Credit losses on securities for which credit losses were not previously recorded	1	3
Reductions for securities sold during the period	(3)	0
U.S. corporate public securities
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Other Asset-backed Securities [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	1	1	$ 1
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded
Reductions for securities sold during the period	0	0
Fixed maturities
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	$ 11	$ 30

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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).

+ References

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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.

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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.

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of decrease in financing receivable from sale and reclassification to held-for-sale. Excludes net investment in lease.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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