Long-term Debt (Narrative) (Details) - USD ($) $ in Millions				12 Months Ended
	Dec. 21, 2018	Jun. 16, 2017	Apr. 28, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 25, 2019	Sep. 28, 2018	Apr. 16, 2018
Debt Instrument [Line Items]
Long-term debt				$ 844	$ 434
Long-term debt maturities, year one				2
Long-term debt maturities, year two				2
Long-term debt maturities, year three				2
Long-term debt maturities, year four				2
Long-term debt maturities, year five				2
Long-term debt maturities, after year five				834
Interest expense on long-term debt				60	6	$ 58
Cash proceeds from issuance of long-term debt				412	228	0
Decrease in notes receivable due from a related party due to exchange of debt for notes receivable due from a related party			$ 1,100
BRCD Reinsurance Financing Arrangement
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity			10,000
Credit facilities, commitment fee amount				41	44	27
Credit facilities, outstanding balance				0
Credit facilities, remaining borrowing capacity				10,000
BLIC Repurchase Facility
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity									$ 2,000
Credit facilities, outstanding balance				0
Affiliated Entity
Debt Instrument [Line Items]
Interest expense on long-term debt				58	4	$ 35
Surplus Note Due 2059
Debt Instrument [Line Items]
Long-term debt				$ 412	0
Debt instrument, face amount							$ 412
Debt instrument, stated interest rate				8.07%			8.07%
Surplus Note Due Dec 2058
Debt Instrument [Line Items]
Long-term debt				$ 200	200
Debt instrument, face amount	$ 200
Cash proceeds from issuance of long-term debt	28
Value of invested assets received from issuance of long-term debt	$ 172
Debt instrument, stated interest rate	8.15%			8.15%
Surplus Note Due Sep 2058
Debt Instrument [Line Items]
Long-term debt				$ 200	$ 200
Debt instrument, face amount								$ 200
Debt instrument, stated interest rate				7.80%				7.80%
Surplus Note Due 2038
Debt Instrument [Line Items]
Decrease in long-term debt due to debt forgiveness		$ 750
Debt instrument, stated interest rate		8.595%
Surplus Notes Due 2032 And 2033
Debt Instrument [Line Items]
Decrease in long-term debt due to exchange of debt for notes receivable due from a related party			$ 1,100
Surplus Note Due 2032
Debt Instrument [Line Items]
Debt instrument, stated interest rate			5.13%
Surplus Note Due 2033
Debt Instrument [Line Items]
Debt instrument, stated interest rate			6.00%