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Condensed Financial Information (Parent Company) (Long-term Debt - Narrative) (Details)
$ in Millions, ¥ in Billions
1 Months Ended 6 Months Ended
May 08, 2018
USD ($)
Apr. 19, 2018
USD ($)
Mar. 19, 2018
USD ($)
Sep. 30, 2016
USD ($)
Apr. 30, 2016
Jun. 30, 2018
Dec. 31, 2018
USD ($)
May 08, 2018
JPY (¥)
Apr. 19, 2018
JPY (¥)
Mar. 19, 2018
JPY (¥)
Dec. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Condensed Financial Statements, Captions [Line Items]                          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net             $ 87       $ 95    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months             2            
Long-term Debt, Maturities, Repayments of Principal in Year Two             512            
Long-term Debt, Maturities, Repayments of Principal in Year Three             368            
Long-term Debt, Maturities, Repayments of Principal in Year Four             797            
Long-term Debt, Maturities, Repayments of Principal in Year Five             1,000            
Long-term Debt, Maturities, Repayments of Principal after Year Five             10,100            
Debt Instrument, Face Amount             3,200       3,200    
Parent Company                          
Condensed Financial Statements, Captions [Line Items]                          
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months             728            
Long-term Debt, Maturities, Repayments of Principal in Year Two             750            
Long-term Debt, Maturities, Repayments of Principal in Year Three             1,400            
Long-term Debt, Maturities, Repayments of Principal in Year Four             500            
Long-term Debt, Maturities, Repayments of Principal in Year Five             1,000            
Long-term Debt, Maturities, Repayments of Principal after Year Five             9,500            
Line of Credit Facility, Maximum Borrowing Capacity                       $ 1,300  
Debt Instrument, Interest Rate Terms         six-month LIBOR plus 1.00%                
Senior Notes             11,844       14,599    
Parent Company | Senior Notes Unaffiliated [Member]                          
Condensed Financial Statements, Captions [Line Items]                          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net             79       86    
Senior Notes             $ 11,844       $ 14,599    
Parent Company | Senior Notes, Affiliated [Member]                          
Condensed Financial Statements, Captions [Line Items]                          
Senior Notes $ 500 $ 500 $ 500 $ 250       ¥ 54.6 ¥ 53.7 ¥ 53.3      
Debt Instrument, Maturity Date Dec. 16, 2021 Jul. 15, 2021 Jun. 30, 2019 Sep. 30, 2020                  
Debt Instrument, Interest Rate, Effective Percentage       3.03%                  
MetLife Exchange Trust I [Member] | Parent Company                          
Condensed Financial Statements, Captions [Line Items]                          
Debt Instrument, Face Amount                       $ 204 $ 10
Debt Instrument, Interest Rate Terms           three-month LIBOR plus 0.7%