Collateral Finance and Securitization Notes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2006
Collateral Finance Facility [Line Items]
Debt Instrument, Face Amount				$ 850,000,000
Direct investment in subsidiary				$ 113,000,000
Assets Held-in-trust	$ 572,000,000	$ 694,000,000
Amount Held In Debt Service Coverage Account	40,000,000	58,000,000
Collateral Financing Expense	17,000,000	29,000,000	$ 30,000,000
Debt Issuance Cost	24,000,000	22,000,000
Reinsurance Group Of America Barbados [Member]
Collateral Finance Facility [Line Items]
Collateral Financing Expense	2,000,000	5,000,000	5,000,000
Timerberlake Financial [Member]
Collateral Finance Facility [Line Items]
Collateral Financing Expense	3,000,000	9,000,000	9,000,000
Chesterfield Financial Holdings LLC [Member]
Collateral Finance Facility [Line Items]
Debt Instrument, Face Amount	300,000,000
Assets Held-in-trust	10,000,000	15,000,000
Collateral Financing Expense	$ 7,000,000	$ 8,000,000	$ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.50%