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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS (Tables)
 12 Months Ended
Dec. 31, 2023
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)20232022
Collateral in trust for non-affiliated agreements (1)
$3,208 $2,406 
Collateral for secured letter of credit facilities1,438 1,509 
Collateral for FHLB borrowings1,077 572 
Securities on deposit with or regulated by government authorities1,447 1,360 
Funds at Lloyd's538 494 
Funds held by reinsureds1,135 1,056 
Total restricted assets$8,843 $7,399 
(1) At December 31, 2023 and December 31, 2022, the total amount on deposit in trust accounts includes $243 million and $122 million of restricted cash respectively.
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 Accounts202320222021
(Dollars in millions)
Ceded written premiums246 201 341 
Ceded earned premiums242 206 333 
Ceded losses and LAE64 191 282 
Assumed written premiums6 5 12 
Assumed earned premiums6 5 12 
Schedule of Collateralized Reinsurance Agreements The table below summarizes the various agreements.
(Dollars in millions)
ClassDescriptionEffective DateExpiration
Date		LimitCoverage Basis
Series 2019-1 Class A-2US, Canada, Puerto Rico – Named Storm and Earthquake Events12/12/201912/19/2024150 Occurrence
Series 2019-1 Class B-2US, Canada, Puerto Rico – Named Storm and Earthquake Events12/12/201912/19/2024275 Aggregate
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
Total available limit as of December 31, 2023$1,375