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Junior Subordinated Debt Securities (Junior Subordinated Debt Securities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (87) $ (82)
Junior Subordinated Notes 3,158 3,156
MetLife Inc $500M Maturing 2069 [Member]    
Debt Instrument [Line Items]    
Face Value 500 500
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (5) (6)
Debt Instrument, Interest Rate, Stated Percentage 10.75%  
Debt Instrument, Interest Rate Terms LIBOR + 7.548%  
Junior Subordinated Notes $ 495 494
Senior notes    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (83) (77)
Debt Instrument, Interest Rate, Stated Percentage 5.70%  
MetLife Capital Trust X $750M Maturing 2068 [Member]    
Debt Instrument [Line Items]    
Face Value $ 750 750
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (9) (9)
Debt Instrument, Interest Rate, Stated Percentage 9.25%  
Debt Instrument, Interest Rate Terms LIBOR + 5.540%  
Junior Subordinated Notes $ 741 741
MetLife Capital Trust IV $700M Maturing 2067 [Member]    
Debt Instrument [Line Items]    
Face Value 700 700
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (13) (13)
Debt Instrument, Interest Rate, Stated Percentage 7.875%  
Debt Instrument, Interest Rate Terms LIBOR + 3.960%  
Junior Subordinated Notes $ 687 687
MetLife Inc $1,250M Maturing 2066 [Member]    
Debt Instrument [Line Items]    
Face Value 1,250 1,250
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (15) (16)
Debt Instrument, Interest Rate, Stated Percentage 6.40%  
Debt Instrument, Interest Rate Terms LIBOR + 2.205%  
Junior Subordinated Notes $ 1,235 1,234
Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Face Value 3,200 3,200
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (42) $ (44)