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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS
 12 Months Ended
Dec. 31, 2024
Collateralized Reinsurance And Trust Agreements [Abstract]  
COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS
The Company maintains certain restricted assets as security for potential future obligations, primarily to support its underwriting operations. 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 
Restricted cash is included in cash on the consolidated balance sheets. At December 31, 2024 and December 31, 2023, the Company had restricted cash of $397 million and $243 million, respectively. Total restricted cash includes amounts on deposit in trust accounts for non-affiliated agreements and secured letter of credit facilities.
The Company reinsures some of its catastrophe exposures with the segregated accounts of a subsidiary, Mt. Logan Re. Mt. Logan Re is a collateralized insurer registered in Bermuda and 100% of the voting common shares are owned by Group. Each segregated account invests predominantly in a diversified set of catastrophe exposures, diversified by risk/peril and across different geographic regions globally.
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 
Effective April 1, 2018, the Company entered into a retroactive reinsurance transaction with one of the Mt. Logan Re segregated accounts to retrocede $269 million of casualty reserves held by Bermuda Re related to accident years 2002 through 2015. As consideration for entering the agreement, the Company transferred cash of $252 million to the Mt. Logan Re segregated account. The maximum liability to be retroceded under the agreement will be $319 million. The Company will retain liability for any amounts exceeding the maximum liability. Effective July 1, 2022, the Company commuted this reinsurance agreement with Mt. Logan segregated account.
The Company entered into various collateralized reinsurance agreements with Kilimanjaro Re Limited (“Kilimanjaro”), a Bermuda-based special purpose reinsurer, to provide the Company with catastrophe reinsurance coverage. These agreements are multi-year reinsurance contracts which cover named storm and earthquake events. 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 
Recoveries under these collateralized reinsurance agreements with Kilimanjaro are primarily dependent on estimated industry level insured losses from covered events, as well as the geographic location of the events. The estimated industry level of insured losses is obtained from published estimates by an independent recognized authority on insured property losses.
Kilimanjaro has financed the various property catastrophe reinsurance coverages by issuing catastrophe bonds to unrelated, external investors. The proceeds from the issuance of the catastrophe bonds are held in reinsurance trusts throughout the duration of the applicable reinsurance agreements and invested solely in U.S. government money market funds with a rating of at least “AAAm” by Standard & Poor’s. The catastrophe bonds’ issue dates, maturity dates and amounts correspond to the reinsurance agreements listed above.