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, 2023	Mar. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 186	$ 98
Securities for which allowance for credit losses were not previously recorded	24	177
Securities sold during the period	(11)	(1)
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	(8)	(84)
Write-offs charged against the allowance	(50)	0
Other	(5)	1
Balance, end of period	136	191
Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	46	8
Securities for which allowance for credit losses were not previously recorded	2	49
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	(4)	(42)
Write-offs charged against the allowance	0	0
Other	2	0
Balance, end of period	45	15
Non- Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	140	90
Securities for which allowance for credit losses were not previously recorded	22	128
Securities sold during the period	(10)	(1)
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)	(42)
Write-offs charged against the allowance	(50)	0
Other	(7)	1
Balance, end of period	$ 91	$ 176