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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 33	$ 34	$ 34	$ 37
Securities for which allowance for credit losses was not previously recorded	2	21	12	51
Securities sold during the period	0	(7)	0	(12)
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)	(14)	7	(20)
Write-offs charged against the allowance	0	(2)	(22)	(23)
Other	7	(2)	9	(3)
Balance, end of period	40	30	40	30
Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	6	7	13	20
Securities for which allowance for credit losses was not previously recorded	2	2	3	4
Securities sold during the period	0	(1)	0	(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	4	2	(4)	(1)
Write-offs charged against the allowance	0	0	0	(10)
Other	0	1	0	1
Balance, end of period	12	11	12	11
Non- Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	27	27	21	17
Securities for which allowance for credit losses was not previously recorded	0	19	9	47
Securities sold during the period	0	(6)	0	(9)
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	(6)	(16)	11	(19)
Write-offs charged against the allowance	0	(2)	(22)	(13)
Other	7	(3)	9	(4)
Balance, end of period	$ 28	$ 19	$ 28	$ 19