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Equity - Dividend Restrictions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Metropolitan Life Insurance Company      
Statutory Accounting Practices [Line Items]      
Paid $ 2,471 $ 3,539  
Metropolitan Life Insurance Company | Scenario, Forecast      
Statutory Accounting Practices [Line Items]      
Permitted without approval     $ 3,476
American Life Insurance Company      
Statutory Accounting Practices [Line Items]      
Paid 1,887 1,289  
American Life Insurance Company | Scenario, Forecast      
Statutory Accounting Practices [Line Items]      
Permitted without approval     945
Metropolitan Tower Life Insurance Company      
Statutory Accounting Practices [Line Items]      
Paid $ 189 $ 0  
Metropolitan Tower Life Insurance Company | Scenario, Forecast      
Statutory Accounting Practices [Line Items]      
Permitted without approval     $ 373