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Collateral Financing Arrangements Collateral Financing Arrangements (Associated with Closed Block) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2007
Debt Instrument [Line Items]        
Invested assets pledged as collateral $ 27,125 $ 26,017    
Parent Company [Member] | Secured Debt Mrc [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate Terms compounded SOFR calculated in arrears plus a spread adjustment of 0.26161%     three-month LIBOR plus 1.12%
Met Life Reinsurance Company Of Charleston [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Principal Outstanding $ 476 637    
Other Receivables 62 85    
Invested Assets On Deposit Held In Trust And Pledged As Collateral 1,330 1,397    
Increase (Decrease) in Other Receivables 23 8 $ 7  
Invested assets pledged as collateral $ 0 $ 10