Investments (PCD Mortgage Loans) (Details) - Mortgage Loans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables purchased with credit deterioration, purchase price	$ 462	$ 159
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date	2	3
Financing receivables purchased with credit deterioration, discount or premium attributable to other factors	(29)	(2)
Financing receivables purchased with credit deterioration, par value	$ 435	$ 160