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Condensed Financial Information (Parent Company) (Loans to Subsidiaries - Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 10, 2017
Apr. 30, 2017
Jul. 31, 2016
Apr. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Apr. 01, 2016
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 $ 750       $ 100 100     $ 140
Debt Instrument, Interest Rate Terms       six-month LIBOR plus 1.00%          
Advances To Affiliate Repayment     $ 140            
Loans to Subsidiaries, Repayment Amount         0 0 $ 140    
Line of Credit Facility, Maximum Borrowing Capacity               $ 1,300  
Parent Company | Interest Income [Member]                  
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]                  
Loans to Subsidiaries, Interest Income         3 44 $ 64    
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 $ 750      
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]                  
Debt Instrument, Interest Rate Terms         LIBOR + 5.540%        
Debt Instrument, Maturity Date         Apr. 08, 2068        
Junior Subordinated Debt Instrument Two [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, 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