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Long-term and Short-term Debt (Committed Facilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Collateral financing arrangement $ 716 $ 766
Committed Credit Facility Six [Member]    
Debt Instrument [Line Items]    
Borrowers MetLife Reinsurance Company of Vermont and MetLife, Inc.  
Line of Credit Facility, Maximum Borrowing Capacity $ 2,896  
Letters of Credit Issued 2,487  
Collateral financing arrangement 0  
Unused Commitments 409  
Committed Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 3,246  
Letters of Credit Issued 2,837  
Collateral financing arrangement 0  
Unused Commitments $ 409  
Committed Credit Facility Three [Member]    
Debt Instrument [Line Items]    
Borrowers MetLife Reinsurance Company of Vermont and MetLife, Inc.  
Line of Credit Facility, Maximum Borrowing Capacity $ 350  
Letters of Credit Issued 350  
Collateral financing arrangement 0  
Unused Commitments 0  
Brighthouse Financial, Inc | Committed Credit Facility Six [Member]    
Debt Instrument [Line Items]    
Letters of Credit Issued $ 2,500