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, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 98	$ 186	$ 7
Securities for which allowance for credit losses were not previously recorded	307	65	328
Purchases of available for sale debt securities accounted for as purchased credit deteriorated assets	0	0	26
Accretion of available for sale debt securities accounted for as purchased credit deteriorated assets	0	0	1
Securities sold during the period	(95)	(33)	(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	(91)	(91)	(17)
Write-offs charged against the allowance	(30)	(29)	(128)
Other	(3)	0	0
Balance, end of year	186	98	186
Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	8	17	7
Securities for which allowance for credit losses were not previously recorded	69	9	38
Purchases of available for sale debt securities accounted for as purchased credit deteriorated assets	0	0	26
Accretion of available for sale debt securities accounted for as purchased credit deteriorated assets	0	0	1
Securities sold during the period	(3)	(4)	(5)
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)	(14)	(50)
Write-offs charged against the allowance	0	0	0
Other	(1)	0	0
Balance, end of year	46	8	17
Non- Structured
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	90	169	0
Securities for which allowance for credit losses were not previously recorded	238	56	290
Purchases of available for sale debt securities accounted for as purchased credit deteriorated assets	0	0	0
Accretion of available for sale debt securities accounted for as purchased credit deteriorated assets	0	0	0
Securities sold during the period	(92)	(29)	(26)
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	(64)	(77)	33
Write-offs charged against the allowance	(30)	(29)	(128)
Other	(2)	0	0
Balance, end of year	$ 140	$ 90	$ 169