Investments - Rollforward of Changes in Allowance for Credit Losses on Available for Sale Fixed Maturity Securities by Major Investment Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 45	$ 33	$ 38	$ 34
Securities for which allowance for credit losses was not previously recorded	2	2	22	12
Securities sold during the period			(6)	0
Addition to (release of) the allowance for credit losses on securities that had an allowance recorded in a previous period, for which there was no intent to sell before recovery of amortized cost basis	3	(2)	5	7
Write-offs charged against the allowance	(5)	0	(14)	(22)
Other	(2)	7	(2)	9
Balance, end of period	43	40	43	40
Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	10	6	10	13
Securities for which allowance for credit losses was not previously recorded	1	2	1	3
Securities sold during the period			0	0
Addition to (release of) the allowance for credit losses on securities that had an allowance recorded in a previous period, for which there was no intent to sell before recovery of amortized cost basis	(1)	4	(1)	(4)
Write-offs charged against the allowance	(5)	0	(5)	0
Other	(1)	0	(1)	0
Balance, end of period	4	12	4	12
Non- Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	35	27	28	21
Securities for which allowance for credit losses was not previously recorded	1	0	21	9
Securities sold during the period			(6)	0
Addition to (release of) the allowance for credit losses on securities that had an allowance recorded in a previous period, for which there was no intent to sell before recovery of amortized cost basis	4	(6)	6	11
Write-offs charged against the allowance	0	0	(9)	(22)
Other	(1)	7	(1)	9
Balance, end of period	$ 39	$ 28	$ 39	$ 28