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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2024
Reinsurance Disclosures [Abstract]  
Schedule of direct, assumed and ceded premiums The following table presents direct, assumed, and ceded premiums:
Year Ended December 31
(in millions of U.S. dollars)202420232022
Premiums written
Direct$56,867 $52,969 $47,511 
Assumed5,136 4,557 4,467 
Ceded(10,535)(10,165)(10,258)
Net$51,468 $47,361 $41,720 
Premiums earned
Direct$55,148 $51,582 $46,160 
Assumed4,970 4,289 4,395 
Ceded(10,272)(10,159)(10,195)
Net$49,846 $45,712 $40,360 
Schedule of Reinsurance Recoverable on Ceded Insurance Reinsurance Recoverable on Ceded Reinsurance
December 31, 2024December 31, 2023
(in millions of U.S. dollars)
Net Reinsurance Recoverable (1)
Valuation allowance
Net Reinsurance Recoverable (1)
Valuation allowance
Reinsurance recoverable on unpaid losses and loss expenses$17,734 $242 $17,884 $285 
Reinsurance recoverable on paid losses and loss expenses2,043 68 2,068 82 
Reinsurance recoverable on losses and loss expenses$19,777 $310 $19,952 $367 
Reinsurance recoverable on policy benefits$289 $— $280 $— 
(1)     Net of valuation allowance for uncollectible reinsurance.
Reinsurance Recoverable, Allowance for Credit Loss
The following table presents a roll-forward of valuation allowance for uncollectible reinsurance related to Reinsurance recoverable on losses and loss expenses:
Year Ended December 31
(in millions of U.S. dollars)20242023
Valuation allowance for uncollectible reinsurance - beginning of year$367 $351 
Provision for (release of) uncollectible reinsurance
(15)47 
Write-offs charged against the valuation allowance(41)(32)
Foreign exchange revaluation(1)1 
Valuation allowance for uncollectible reinsurance - end of year$310 $367 
Reinsurance Recoverable, Credit Quality Indicator
The following tables present a listing, at December 31, 2024, of the categories of Chubb's reinsurers:
December 31, 2024Gross Reinsurance Recoverable on Losses and Loss ExpensesValuation allowance for Uncollectible Reinsurance% of Gross Reinsurance Recoverable
(in millions of U.S. dollars, except for percentages)
Categories
Largest reinsurers$10,278 $116 1.1 %
Other reinsurers rated A- or better5,557 67 1.2 %
Other reinsurers rated lower than A- or not rated441 27 6.1 %
Pools422 10 2.4 %
Structured settlements489 8 1.6 %
Captives2,704 13 0.5 %
Other196 69 35.2 %
Total$20,087 $310 1.5 %