Investments - Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Receivables	Receivables
Accrued interest receivables on available-for-sale fixed maturity securities	$ 435	$ 394
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	1	18
Securities for which credit losses were not previously recorded	17	0
Available-for-sale securities accounted for as PCD assets	22	3
Securities sold during the period (realized)	6	0
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis	8
Write-offs charged against the allowance	15	12
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	5	(8)
Ending balance	16	1
Corporate bonds and other
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	0	11
Securities for which credit losses were not previously recorded	10
Available-for-sale securities accounted for as PCD assets	22
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	8
Write-offs charged against the allowance	15	12
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	1	1
Ending balance	4	0
Asset-backed
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	1	7
Securities for which credit losses were not previously recorded	7
Available-for-sale securities accounted for as PCD assets		3
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
Write-offs charged against the allowance
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	4	(9)
Ending balance	$ 12	$ 1