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Condensed Financial Information (Parent Company) (Loans to Subsidiaries - Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Face Amount   $ 3,200 $ 3,200  
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]        
Debt Instrument, Description of Variable Rate Basis   three-month LIBOR    
Parent Company        
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]        
Loans to subsidiaries and affiliates   $ 100 100  
Parent Company | Interest Income [Member]        
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]        
Loans to Subsidiaries, Interest Income   3 3 $ 44
Parent Company | Surplus Note September 2032 [Member]        
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]        
Loans to subsidiaries and affiliates $ 750      
Advances To Affiliate Instrument Interest Rate Effective Percentage 5.13%      
Parent Company | Surplus Note December 2033 [Member]        
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]        
Loans to subsidiaries and affiliates $ 350      
Advances To Affiliate Instrument Interest Rate Effective Percentage 6.00%      
Junior Subordinated Debt Instrument Two [Member]        
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Face Amount   $ 750 $ 750  
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]        
Debt Instrument, Maturity Date   Apr. 08, 2068    
Senior Note Issued To Metlife Reinsurance Company Of Delaware [Member] | Senior Notes Affiliated December 2033 [Member] | Parent Company        
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Face Amount $ 350      
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]        
Debt Instrument, Interest Rate, Effective Percentage 5.10%      
Debt Instrument, Maturity Date Dec. 31, 2033      
Senior Note Issued To Metlife Reinsurance Company Of Delaware [Member] | Senior Notes Affiliated September 2032 [Member] | Parent Company        
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Face Amount $ 750      
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]        
Debt Instrument, Interest Rate, Effective Percentage 4.21%      
Debt Instrument, Maturity Date Sep. 30, 2032