Investments - Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Accrued interest receivables on available-for-sale fixed maturity securities	$ 407	$ 389	$ 394
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1	18
Available-for-sale securities accounted for as PCD assets	9
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 or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	1	(1)
Ending balance	2	17
Corporate bonds and other
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	0	11
Available-for-sale securities accounted for as PCD assets	9
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 or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	1	1
Ending balance	1	12
Asset-backed
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1	7
Available-for-sale securities accounted for as PCD assets
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 or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period		(2)
Ending balance	$ 1	$ 5