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Debt and Collateral Financing Arrangement (Long-term Debt) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt $ 3,615 $ 1,910
Long Term Debt Excluding Consolidated Securitization Entities Face Value 3,601 1,887
Consolidated Securitization Entities    
Debt Instrument [Line Items]    
Long-term Debt $ 14 23
Line of Credit    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Dec. 02, 2019  
Debt Instrument, Interest Rate Terms LIBOR plus 1.5%  
Long-term Debt $ 600 $ 0
Debt Instrument, Basis Spread on Variable Rate 1.50% 0.00%
MRSC Collateral Financing Arrangement    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Jun. 30, 2037  
Debt Instrument, Interest Rate Terms 3-month LIBOR plus 0.70%  
Long-term Debt $ 0 $ 2,797
Debt Instrument, Basis Spread on Variable Rate 0.00% 0.70%
Senior Notes | BHF Senior Notes due 2027    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.70%  
Debt Instrument, Maturity Date Jun. 22, 2027  
Long-term Debt $ 1,489 $ 0
Senior Notes | BHF Senior Notes due 2047    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.70%  
Debt Instrument, Maturity Date Jun. 22, 2047  
Long-term Debt $ 1,476 0
Surplus Notes | MLUSA Surplus Notes due 2038 | Affiliated Entity    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 8.595%  
Debt Instrument, Maturity Date Apr. 08, 2038  
Long-term Debt $ 0 750
Surplus Notes | MRD Surplus Notes due 2032 | Affiliated Entity    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.13%  
Debt Instrument, Maturity Date Sep. 30, 2032  
Long-term Debt $ 0 750
Surplus Notes | MRD Surplus Notes due 2033 | Affiliated Entity    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 6.00%  
Debt Instrument, Maturity Date Dec. 31, 2033  
Long-term Debt $ 0 350
Long-term Debt    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 7.028%  
Debt Instrument, Maturity Date Nov. 30, 2030  
Long-term Debt $ 36 $ 37