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Long-term and Short-term Debt (Committed Facilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Collateral financing arrangements $ 4,139 $ 4,196
Committed Credit Facility Total [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 11,856  
Letters of Credit Issued 6,616  
Collateral financing arrangements 2,797  
Unused Commitments $ 2,443  
Committed Credit Facility Two [Member]    
Debt Instrument [Line Items]    
Borrowers MetLife, Inc. and Missouri Reinsurance, Inc.  
Expiration Jun. 30, 2016  
Line of Credit Facility, Maximum Borrowing Capacity $ 210  
Letters of Credit Issued 210  
Collateral financing arrangements 0  
Unused Commitments $ 0  
Committed Credit Facility Three [Member]    
Debt Instrument [Line Items]    
Borrowers MetLife Reinsurance Company of Vermont and MetLife, Inc.  
Expiration Dec. 28, 2024  
Line of Credit Facility, Maximum Borrowing Capacity $ 575  
Letters of Credit Issued 465  
Collateral financing arrangements 0  
Unused Commitments $ 110  
Committed Credit Facility Four [Member]    
Debt Instrument [Line Items]    
Borrowers MetLife, Inc.  
Expiration Jun. 20, 2018  
Line of Credit Facility, Maximum Borrowing Capacity $ 425  
Letters of Credit Issued 425  
Collateral financing arrangements 0  
Unused Commitments $ 0  
Committed Credit Facility Five [Member]    
Debt Instrument [Line Items]    
Borrowers MetLife Reinsurance Company of South Carolina and MetLife, Inc.  
Expiration Jun. 30, 2037  
Line of Credit Facility, Maximum Borrowing Capacity $ 3,500  
Letters of Credit Issued 0  
Collateral financing arrangements 2,797  
Unused Commitments $ 703  
Committed Credit Facility Six [Member]    
Debt Instrument [Line Items]    
Borrowers MetLife Reinsurance Company of Vermont and MetLife, Inc.  
Expiration Dec. 31, 2037  
Line of Credit Facility, Maximum Borrowing Capacity $ 2,896  
Letters of Credit Issued 2,159  
Collateral financing arrangements 0  
Unused Commitments $ 737  
Committed Credit Facility Seven [Member]    
Debt Instrument [Line Items]    
Borrowers MetLife Reinsurance Company of Vermont and MetLife, Inc.  
Expiration Sep. 20, 2038  
Line of Credit Facility, Maximum Borrowing Capacity $ 4,250  
Letters of Credit Issued 3,357  
Collateral financing arrangements 0  
Unused Commitments $ 893