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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS (Tables)
 6 Months Ended
Jun. 30, 2025
Collateralized Reinsurance And Trust Agreements [Abstract]  
Schedule of Restricted Assets The following table summarizes the Company’s restricted assets:
At June 30,At December 31,
(Dollars in millions)20252024
Collateral in trust for non-affiliated agreements$3,548 $3,241 
Collateral for secured letter of credit facilities840 1,386 
Collateral for FHLB borrowings1,321 1,294 
Securities on deposit with or regulated by government authorities1,450 1,406 
Funds at Lloyd's300 341 
Funds held by reinsureds1,291 1,218 
Total restricted assets8,749 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
June 30,		Six Months Ended
June 30,
Mt. Logan Re Segregated Accounts2025202420252024
(Dollars in millions)
Ceded written premiums$80 $82 $250 $169 
Ceded earned premiums92 94 216 180 
Ceded losses and LAE— 26 121 64 
Assumed written premiums2 1 5 3 
Assumed earned premiums2 1 5 3 
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-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 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
Series 2025-1 Class A-1US, Canada, Puerto Rico – Named Storm and Earthquake Events6/26/20257/9/2029105 Aggregate
Series 2025-2 Class A-2US, Canada, Puerto Rico – Named Storm and Earthquake Events6/26/20257/8/2030105 Aggregate
Series 2025-1 Class B-1US, Canada, Puerto Rico – Named Storm and Earthquake Events6/26/20257/9/2029120 Aggregate
Series 2025-2 Class B-2US, Canada, Puerto Rico – Named Storm and Earthquake Events6/26/20257/8/2030120 Aggregate
Series 2025-1 Class C-1US, Canada, Puerto Rico – Named Storm and Earthquake Events6/26/20257/9/2029170 Occurrence
Series 2025-2 Class C-2US, Canada, Puerto Rico – Named Storm and Earthquake Events6/26/20257/8/2030170 Occurrence
Series 2025-1 Class D-1US, Canada, Puerto Rico – Named Storm and Earthquake Events6/26/20257/9/2029105 Occurrence
Series 2025-2 Class D-2US, Canada, Puerto Rico – Named Storm and Earthquake Events6/26/20257/8/2030105 Occurrence
Total available limit as of June 30, 2025$1,530