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		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 30	$ 28	$ 38	$ 34
Securities for which allowance for credit losses was not previously recorded	18	6	20	10
Securities sold during the period	(2)	(1)	(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	0	12	2	9
Write-offs charged against the allowance	(1)	(14)	(9)	(22)
Other	0	2	0	2
Balance, end of period	45	33	45	33
Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	11	3	10	13
Securities for which allowance for credit losses was not previously recorded	0	1	0	1
Securities sold during the period	0	0	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)	2	0	(8)
Write-offs charged against the allowance	0	0	0	0
Other	0	0	0	0
Balance, end of period	10	6	10	6
Non- Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	19	25	28	21
Securities for which allowance for credit losses was not previously recorded	18	5	20	9
Securities sold during the period	(2)	(1)	(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	1	10	2	17
Write-offs charged against the allowance	(1)	(14)	(9)	(22)
Other	0	2	0	2
Balance, end of period	$ 35	$ 27	$ 35	$ 27