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Condensed Financial Information (Parent Company) (Loans to Subsidiaries - Narrative) (Details) - Parent Company - USD ($)
$ in Millions
1 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2016
Jun. 30, 2016
Apr. 30, 2016
May 31, 2015
Apr. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 01, 2016
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]                          
Loans to subsidiaries and affiliates                 $ 1,200 $ 1,200     $ 140
Debt Instrument, Interest Rate Terms     six-month LIBOR plus 1.00%                    
Advances To Affiliate Repayment $ 140                        
Senior Notes                 15,505 16,994      
Loans to Subsidiaries, Repayment Amount                 140 761 $ 832    
Line of Credit Facility, Maximum Borrowing Capacity                 1,300        
Interest Income [Member]                          
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]                          
Loans to Subsidiaries, Interest Income                 $ 64 91 155    
American Life $150 Million May 2015 [Member]                          
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]                          
Loans to subsidiaries and affiliates       $ 150                  
Debt Instrument, Interest Rate Terms       six-month LIBOR plus 1.00%                  
Advances To Affiliate Repayment   $ 150                      
American Life $150 Million April 2015 [Member]                          
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]                          
Loans to subsidiaries and affiliates         $ 150                
Debt Instrument, Interest Rate Terms         six-month LIBOR plus 0.875%                
Advances To Affiliate Repayment       $ 150                  
American Life Loan One [Member]                          
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]                          
Loans to subsidiaries and affiliates                     $ 100    
Advances To Affiliate Instrument Interest Rate Effective Percentage                     3.17%    
Loans to subsidiaries, maturity date                     Jun. 30, 2020    
American Life Loan Two [Member]                          
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]                          
Loans to subsidiaries and affiliates                     $ 120    
Debt Instrument, Interest Rate Terms                     six-month LIBOR plus 0.875%    
Advances To Affiliate Repayment                     $ 120    
American Life Loan Three [Member]                          
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]                          
Loans to subsidiaries and affiliates                     $ 150    
Debt Instrument, Interest Rate Terms                     six-month LIBOR plus 0.875%    
Advances To Affiliate Repayment                     $ 150    
MetLife Ireland Treasury Limited loan from MetLife, Inc.                          
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract]                          
Loans to subsidiaries and affiliates                       $ 1,500  
Advances To Affiliate Instrument Interest Rate Effective Percentage                       8.50%  
Loans to subsidiaries, maturity date                       Jul. 01, 2023  
Loans to Subsidiaries, Repayment Amount           $ 231 $ 69 $ 153   $ 77 $ 493