Investments, Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Accrued interest receivables on available-for-sale fixed maturity securities	$ 369	$ 371
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	40	0
Additions to allowance for securities for which credit losses were not previously recorded	14	79
Additions to allowance for available-for-sale securities accounted for as PCD assets	11	5
Reductions for securities sold during the period (realized)	24	22
Reductions to the allowance for credit losses due to Write-offs charged against the allowance	16
Reductions for intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis		1
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	(7)	(27)
Total allowance for credit losses	18	40
Cumulative Effect, Period of Adoption, Adjustment | ASC 326
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Impact of adopting ASC 326			$ 6
Corporate bonds and other
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	23	0
Additions to allowance for securities for which credit losses were not previously recorded	14	67
Additions to allowance for available-for-sale securities accounted for as PCD assets	5	5
Reductions for securities sold during the period (realized)	7	22
Reductions to the allowance for credit losses due to Write-offs charged against the allowance	16
Reductions for intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis		1
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period	(8)	(32)
Total allowance for credit losses	11	23
Corporate bonds and other | Cumulative Effect, Period of Adoption, Adjustment | ASC 326
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Impact of adopting ASC 326			6
Asset-backed
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	17	0
Additions to allowance for securities for which credit losses were not previously recorded		12
Additions to allowance for available-for-sale securities accounted for as PCD assets	6
Reductions for securities sold during the period (realized)	17
Reductions to the allowance for credit losses due to Write-offs charged against the allowance
Reductions for 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	1	5
Total allowance for credit losses	$ 7	$ 17
Asset-backed | Cumulative Effect, Period of Adoption, Adjustment | ASC 326
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Impact of adopting ASC 326