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Long-term Debt (Details) - USD ($)
Apr. 16, 2018
Sep. 30, 2018
Sep. 28, 2018
BLIC Repurchase Facility      
Debt Instrument [Line Items]      
Credit facilities, maximum borrowing capacity $ 2,000,000,000    
Credit facilities, term 3 years    
Credit facilities, amount outstanding   $ 0  
BLIC Surplus Note      
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 200,000,000
Debt instrument, interest rate     7.80%