Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables purchased from third parties	$ 311	$ 2,200
Accrued interest receivable	123	115
Financing receivables purchased with credit deterioration, par value	0	69
Financing receivables in nonaccrual status, investment income	2	2
Financing Receivable, Troubled Debt Restructuring	$ 0	$ 0
Minimum | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit losses by performance status as a percentage of financing receivables, before allowance for credit losses	99.00%	99.00%