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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 175	$ 97	$ 98	$ 186
Securities for which allowance for credit losses were not previously recorded	31	20	238	56
Securities sold during the period	(46)	(21)	(88)	(31)
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	(37)	(24)	(103)	(127)
Write-offs charged against the allowance	(7)	(6)	(29)	(18)
Other	(1)	0	(1)	0
Balance, end of period	115	66	115	66
Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	26	10	8	17
Securities for which allowance for credit losses were not previously recorded	6	0	57	8
Securities sold during the period	(1)	0	(2)	(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	0	(3)	(32)	(15)
Write-offs charged against the allowance	0	0	0	0
Other	(1)	0	(1)	0
Balance, end of period	30	7	30	7
Non- Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	149	87	90	169
Securities for which allowance for credit losses were not previously recorded	25	20	181	48
Securities sold during the period	(45)	(21)	(86)	(28)
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	(37)	(21)	(71)	(112)
Write-offs charged against the allowance	(7)	(6)	(29)	(18)
Other	0	0	0	0
Balance, end of period	$ 85	$ 59	$ 85	$ 59