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Long-term and Short-term Debt (Credit Facilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Collateral financing arrangement $ 1,060 $ 1,121
General Credit Facility Three [Member]    
Debt Instrument [Line Items]    
Borrowers MetLife, Inc. and MetLife Funding, Inc.  
Expiration Dec. 20, 2021  
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000  
Letters of Credit Issued 446  
Collateral financing arrangement 0  
Unused Commitments $ 2,554  
Standby Letters of Credit [Member] | General Credit Facility Three [Member]    
Debt Instrument [Line Items]    
Expiration Dec. 20, 2022