Investments - Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Accrued interest receivables on available-for-sale fixed maturity securities	$ 413	$ 374	$ 413	$ 374	$ 394
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	2	17	1	18
Securities for which credit losses were not previously recorded	8		8
Available-for-sale securities accounted for as PCD assets	11	3	20	3
Write-offs charged against the allowance		12		12
Securities sold during the period (realized)			6
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis			3
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	1	(3)	2	(4)
Ending balance	22	5	22	5
Corporate bonds and other
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1	12	0	11
Securities for which credit losses were not previously recorded	1		1
Available-for-sale securities accounted for as PCD assets	11		20
Write-offs charged against the allowance		12		12
Securities sold during the period (realized)			6
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis			3
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period			1	1
Ending balance	13	0	13	0
Asset-backed
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1	5	1	7
Securities for which credit losses were not previously recorded	7		7
Available-for-sale securities accounted for as PCD assets		3		3
Write-offs charged against the allowance
Securities sold during the period (realized)
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	1	(3)	1	(5)
Ending balance	$ 9	$ 5	$ 9	$ 5