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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 125	$ 175	$ 186	$ 98
Securities for which allowance for credit losses were not previously recorded	77	31	157	238
Securities sold during the period	(17)	(46)	(46)	(88)
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	(23)	(37)	(29)	(103)
Write-offs charged against the allowance	(27)	(7)	(124)	(29)
Other	3	(1)	(6)	(1)
Balance, end of period	138	115	138	115
Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	47	26	46	8
Securities for which allowance for credit losses were not previously recorded	12	6	30	57
Securities sold during the period	(1)	(1)	(4)	(2)
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	0	0	(32)
Write-offs charged against the allowance	(15)	0	(25)	0
Other	0	(1)	0	(1)
Balance, end of period	47	30	47	30
Non- Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	78	149	140	90
Securities for which allowance for credit losses were not previously recorded	65	25	127	181
Securities sold during the period	(16)	(45)	(42)	(86)
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	(27)	(37)	(29)	(71)
Write-offs charged against the allowance	(12)	(7)	(99)	(29)
Other	3	0	(6)	0
Balance, end of period	$ 91	$ 85	$ 91	$ 85