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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS (Tables)
 3 Months Ended
Mar. 31, 2025
Collateralized Reinsurance And Trust Agreements [Abstract]  
Schedule of Restricted Assets The following table summarizes the Company’s restricted assets:
At March 31,At December 31,
(Dollars in millions)20252024
Collateral in trust for non-affiliated agreements$3,396 $3,241 
Collateral for secured letter of credit facilities1,203 1,386 
Collateral for FHLB borrowings1,317 1,294 
Securities on deposit with or regulated by government authorities1,434 1,406 
Funds at Lloyd's347 341 
Funds held by reinsureds1,237 1,218 
Total restricted assets8,934 8,885 
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.
Three Months Ended
March 31,
Mt. Logan Re Segregated Accounts20252024
(Dollars in millions)
Ceded written premiums$170 $87 
Ceded earned premiums125 87 
Ceded losses and LAE121 38 
Assumed written premiums3 1 
Assumed earned premiums3 1 
Assumed losses and LAE— — 
Schedule of Collateralized Reinsurance Agreements The table below summarizes the various agreements.
(Dollars in millions)
ClassDescriptionEffective DateExpiration DateLimitCoverage 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 March 31, 2025$1,150