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
	Mar. 31, 2026	Mar. 31, 2025
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 37	$ 38
Securities for which allowance for credit losses was not previously recorded	6	2
Securities sold during the period	(3)	(4)
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	(2)	2
Write-offs charged against the allowance	0	(8)
Balance, end of period	38	30
Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	5	10
Securities for which allowance for credit losses was not previously recorded	2	0
Securities sold during the period	(1)	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	1
Write-offs charged against the allowance	0	0
Balance, end of period	6	11
Non- Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	32	28
Securities for which allowance for credit losses was not previously recorded	4	2
Securities sold during the period	(2)	(4)
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	(2)	1
Write-offs charged against the allowance	0	(8)
Balance, end of period	$ 32	$ 19