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Condensed Financial Information (Parent Company) (Long-term Debt - Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Apr. 30, 2016
Mar. 31, 2016
Jun. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]              
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net           $ 69 $ 74
Debt Instrument, Unamortized Discount           34 36
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months           1,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two           1,000  
Long-term Debt, Maturities, Repayments of Principal in Year Three           1,000  
Long-term Debt, Maturities, Repayments of Principal in Year Four           838  
Long-term Debt, Maturities, Repayments of Principal in Year Five           998  
Long-term Debt, Maturities, Repayments of Principal after Year Five           11,500  
Parent Company              
Condensed Financial Statements, Captions [Line Items]              
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months           1,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two           1,000  
Long-term Debt, Maturities, Repayments of Principal in Year Three           1,800  
Long-term Debt, Maturities, Repayments of Principal in Year Four           742  
Long-term Debt, Maturities, Repayments of Principal in Year Five           2,000  
Long-term Debt, Maturities, Repayments of Principal after Year Five           12,000  
Line of Credit Facility, Maximum Borrowing Capacity           1,300  
Debt Instrument, Interest Rate Terms     six-month LIBOR plus 1.00%        
Senior Notes           15,505 16,994
Parent Company | Senior Notes Unaffiliated [Member]              
Condensed Financial Statements, Captions [Line Items]              
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net           62 67
Debt Instrument, Unamortized Discount           30 31
Senior Notes           $ 15,505 16,927
Parent Company | Senior Notes, Affiliated [Member]              
Condensed Financial Statements, Captions [Line Items]              
Senior Notes $ 250       $ 500    
Debt Instrument, Maturity Date Sep. 30, 2020       Jun. 30, 2019    
Debt Instrument, Interest Rate, Effective Percentage 3.03%            
Parent Company | Senior Notes, Affiliated [Member] | $750 Million Senior Note Issued to Metropolitan Life Insurance Company [Member] | $500 Million Senior Note Metropolitan Life Insurance Company [Member]              
Condensed Financial Statements, Captions [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage         3.54%    
Parent Company | Senior Notes, Affiliated [Member] | $250 Million Senior Note Issued to Metropolitan Life Insurance Company [Member]              
Condensed Financial Statements, Captions [Line Items]              
Senior Notes         $ 500    
MetLife Exchange Trust I [Member] | Parent Company              
Condensed Financial Statements, Captions [Line Items]              
Repayments of affiliated debt   $ 204   $ 10     $ 286
Debt Instrument, Interest Rate Terms           three-month LIBOR plus 0.7%