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Reinsurance - Schedule of Assets in Support of Reserves (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Ceded Credit Risk [Line Items]    
Fixed maturity AFS securities $ 84,571 $ 82,300
Mortgage loans on real estate 20,701 18,873
Accrued investment income 1,032 $ 982
LPINE    
Ceded Credit Risk [Line Items]    
Fixed maturity AFS securities 8,932  
Mortgage loans on real estate 1,481  
Accrued investment income 93  
Total $ 10,506