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, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 186	$ 98	$ 186
Securities for which allowance for credit losses were not previously recorded	199	307	65
Securities sold during the period	(40)	(95)	(33)
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	21	(91)	(91)
Write-offs charged against the allowance	(198)	(30)	(29)
Other	(6)	(3)
Balance, end of year	162	186	98
Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	46	8	17
Securities for which allowance for credit losses were not previously recorded	65	69	9
Securities sold during the period	(5)	(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	(10)	(27)	(14)
Write-offs charged against the allowance	(30)	0
Other	3	(1)
Balance, end of year	69	46	8
Non- Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	140	90	169
Securities for which allowance for credit losses were not previously recorded	134	238	56
Securities sold during the period	(35)	(92)	(29)
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	31	(64)	(77)
Write-offs charged against the allowance	(168)	(30)	(29)
Other	(9)	(2)
Balance, end of year	$ 93	$ 140	$ 90