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Condensed Financial Information (Parent Company) (Subsequent Events - Narrative) (Details) - Parent Company - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]        
Senior notes   $ 16,994 $ 15,317  
Capital contributions to subsidiaries   (667) (1,262) $ (748)
Advances to Affiliate   $ 1,200 $ 1,709  
Metlife Reinsurance Company of Vermont | Subsequent Event        
Condensed Financial Statements, Captions [Line Items]        
Capital contributions to subsidiaries $ (50)      
MetLife Reinsurance Company of Delaware | Subsequent Event        
Condensed Financial Statements, Captions [Line Items]        
Capital contributions to subsidiaries (45)      
MetLife Reinsurance Company Of South Carolina | Subsequent Event        
Condensed Financial Statements, Captions [Line Items]        
Capital contributions to subsidiaries (25)      
MetLife Insurance Company USA | Subsequent Event        
Condensed Financial Statements, Captions [Line Items]        
Capital contributions to subsidiaries $ (1,500)