Investments - Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available For Sale, Accrued Interest After Allowance For Credit Loss, Statement Of Financial Position Extensible List Not Disclosed Flag	true
Accrued interest receivables on available-for-sale fixed maturity securities	$ 470	$ 442
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	45	16
Securities for which credit losses were not previously recorded	6	27
Available-for-sale securities accounted for as PCD assets	4	4
Securities disposed during the period (realized)	6	4
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis		1
Write-offs charged against the allowance		9
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	20	12
Ending balance	69	45
Corporate bonds and other
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	13	4
Securities for which credit losses were not previously recorded	3	9
Available-for-sale securities accounted for as PCD assets	4	4
Securities disposed during the period (realized)	6	3
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis		1
Write-offs charged against the allowance
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	14
Ending balance	28	13
Asset-backed
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Beginning balance	32	12
Securities for which credit losses were not previously recorded	3	18
Available-for-sale securities accounted for as PCD assets
Securities disposed during the period (realized)		1
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		9
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period	6	12
Ending balance	$ 41	$ 32