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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS (Tables)
 12 Months Ended
Dec. 31, 2024
Collateralized Reinsurance And Trust Agreements [Abstract]  
Schedule of Restricted Assets The following table summarizes the Company’s restricted assets:
At December 31,
(Dollars in millions)20242023
Collateral in trust for non-affiliated agreements$3,241 $3,208 
Collateral for secured letter of credit facilities 1,386 1,438 
Collateral for FHLB borrowings1,294 1,077 
Securities on deposit with or regulated by government authorities1,406 1,447 
Funds at Lloyd's341 538 
Funds held by reinsureds1,218 1,135 
Total restricted assets$8,885 $8,843 
Schedule of Premiums and Losses Ceded
The following table summarizes the premiums and losses that are ceded by the Company to Mt. Logan Re segregated accounts and assumed by the Company from Mt. Logan Re segregated accounts.
Years Ended December 31,
Mt. Logan Re Segregated Accounts202420232022
(Dollars in millions)
Ceded written premiums433 246 201 
Ceded earned premiums376 242 206 
Ceded losses and LAE188 64 191 
Assumed written premiums10 6 5 
Assumed earned premiums10 6 5 
Schedule of Collateralized Reinsurance Agreements The table below summarizes the various agreements.
(Dollars in millions)
ClassDescriptionEffective DateExpiration
Date		LimitCoverage Basis
Series 2021-1 Class A-1US, Canada, Puerto Rico – Named Storm and Earthquake Events4/8/20214/21/2025150 Occurrence
Series 2021-1 Class B-1US, Canada, Puerto Rico – Named Storm and Earthquake Events4/8/20214/21/202585 Aggregate
Series 2021-1 Class C-1US, Canada, Puerto Rico – Named Storm and Earthquake Events4/8/20214/21/202585 Aggregate
Series 2021-1 Class A-2US, Canada, Puerto Rico – Named Storm and Earthquake Events4/8/20214/20/2026150 Occurrence
Series 2021-1 Class B-2US, Canada, Puerto Rico – Named Storm and Earthquake Events4/8/20214/20/202690 Aggregate
Series 2021-1 Class C-2US, Canada, Puerto Rico – Named Storm and Earthquake Events4/8/20214/20/202690 Aggregate
Series 2022-1 Class AUS, Canada, Puerto Rico – Named Storm and Earthquake Events6/22/20226/25/2025300 Aggregate
Series 2024-1 Class AUS, Canada, Puerto Rico – Named Storm and Earthquake Events6/27/20246/30/202875 Occurrence
Series 2024-1 Class BUS, Canada, Puerto Rico – Named Storm and Earthquake Events6/27/20246/30/2028125 Occurrence
Total available limit as of December 31, 2024$1,150