Investments - Rollforward of Changes in Allowance for Credit Losses on Available for Sale Fixed Maturity Securities by Major Investment Category (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 34	$ 37	$ 21
Securities for which allowance for credit losses was not previously recorded	15	52	131
Securities sold during the period	(6)	(12)	(45)
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	10	(8)	(59)
Write-offs charged against the allowance	(24)	(37)	(6)
Other	9	2	(5)
Balance, end of year	38	34	37
Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	13	20	2
Securities for which allowance for credit losses was not previously recorded	5	6	32
Securities sold during the period	(4)	(3)
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)	(1)	(13)
Write-offs charged against the allowance	0	(11)
Other	(1)	2	(1)
Balance, end of year	10	13	20
Non- Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	21	17	19
Securities for which allowance for credit losses was not previously recorded	10	46	99
Securities sold during the period	(2)	(9)	(45)
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	13	(7)	(46)
Write-offs charged against the allowance	(24)	(26)	(6)
Other	10	0	(4)
Balance, end of year	$ 28	$ 21	$ 17