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Claim and Claim Adjustment Expense Reserves - A&EP Reserves (Details) - A&EP Reserves - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2010
Dec. 31, 2023
A&EP Reserves [Abstract]            
Net A&EP claim and allocated claim adjustment expense reserves         $ 1,600  
Aggregate limit under A&EP loss portfolio transfer         4,000  
Ceded A&EP claim and allocated claim adjustment expense reserves under existing third party reinsurance contracts transferred to NICO under A&EP loss portfolio transfer         1,200  
Reinsurance premium paid to NICO under A&EP loss portfolio transfer         2,000  
Net reinsurance receivables transferred to NICO under A&EP loss portfolio transfer         215  
Total consideration         $ 2,200  
Retroactive reinsurance benefit recognized $ 11 $ 15 $ 36 $ 38    
Cumulative amounts ceded under loss portfolio transfer 3,600   3,600     $ 3,600
Unrecognized deferred retroactive reinsurance benefit 382   382     $ 417
Fair value of collateral trust account $ 2,300   $ 2,300