XML 40 R29.htm IDEA: XBRL DOCUMENT
v3.25.3

Allowance for Expected Credit Losses (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2025
Credit Loss [Abstract] |
Changes in the allowance for expected credit losses on premiums receivable [Table Text Block] | The following tables present the balances of premiums receivable, net of the allowance for expected credit losses, as of September 30, 2025 and 2024, and the changes in the allowance for expected credit losses for the three and nine months ended September 30, 2025 and 2024.
|  | As of and For the Three Months Ended September 30, 2025 |  | As of and For the Three Months Ended September 30, 2024 |  |
(in millions) |  | Premiums Receivable, Net of Allowance for Expected Credit Losses |  | Allowance for Expected Credit Losses |  | Premiums Receivable, Net of Allowance for Expected Credit Losses |  | Allowance for Expected Credit Losses |  |  |  |
Balance, beginning of period |  | $ | 12,042 |  |  | $ | 61 |  |  | $ | 11,491 |  |  | $ | 69 |  |  |  |  |
Current period change for expected credit losses |  |  |  | 13 |  |  |  |  | 16 |  |  |  |  |
Write-offs of uncollectible premiums receivable |  |  |  | 16 |  |  |  |  | 15 |  |  |  |  |
Balance, end of period |  | $ | 11,621 |  |  | $ | 58 |  |  | $ | 11,271 |  |  | $ | 70 |  |  |  |  |
|  | As of and For the Nine Months Ended September 30, 2025 |  | As of and For the Nine Months Ended September 30, 2024 |  |
(in millions) |  | Premiums Receivable, Net of Allowance for Expected Credit Losses |  | Allowance for Expected Credit Losses |  | Premiums Receivable, Net of Allowance for Expected Credit Losses |  | Allowance for Expected Credit Losses |  |  |  |
Balance, beginning of period |  | $ | 11,110 |  |  | $ | 58 |  |  | $ | 10,282 |  |  | $ | 69 |  |  |  |  |
Current period change for expected credit losses |  |  |  | 48 |  |  |  |  | 41 |  |  |  |  |
Write-offs of uncollectible premiums receivable |  |  |  | 48 |  |  |  |  | 40 |  |  |  |  |
Balance, end of period |  | $ | 11,621 |  |  | $ | 58 |  |  | $ | 11,271 |  |  | $ | 70 |  |  |  |  |
Changes in the allowance for estimated uncollectible reinsurance [Table Text Block] | The following tables present the balances of reinsurance recoverables, net of the allowance for estimated uncollectible reinsurance, as of September 30, 2025 and 2024, and the changes in the allowance for estimated uncollectible reinsurance for the three and nine months ended September 30, 2025 and 2024.
|  | As of and For the Three Months Ended September 30, 2025 |  | As of and For the Three Months Ended September 30, 2024 |  |
(in millions) |  | Reinsurance Recoverables, Net of Allowance for Estimated Uncollectible Reinsurance |  | Allowance for Estimated Uncollectible Reinsurance |  | Reinsurance Recoverables, Net of Allowance for Estimated Uncollectible Reinsurance |  | Allowance for Estimated Uncollectible Reinsurance |  |  |  |
Balance, beginning of period |  | $ | 8,059 |  |  | $ | 127 |  |  | $ | 8,132 |  |  | $ | 117 |  |  |  |  |
Current period change for estimated uncollectible reinsurance |  |  |  | 14 |  |  |  |  | 3 |  |  |  |  |
Write-offs of uncollectible reinsurance recoverables |  |  |  | — |  |  |  |  | — |  |  |  |  |
Balance, end of period |  | $ | 8,298 |  |  | $ | 141 |  |  | $ | 8,075 |  |  | $ | 120 |  |  |  |  |
|  | As of and For the Nine Months Ended September 30, 2025 |  | As of and For the Nine Months Ended September 30, 2024 |  |
(in millions) |  | Reinsurance Recoverables, Net of Allowance for Estimated Uncollectible Reinsurance |  | Allowance for Estimated Uncollectible Reinsurance |  | Reinsurance Recoverables, Net of Allowance for Estimated Uncollectible Reinsurance |  | Allowance for Estimated Uncollectible Reinsurance |  |  |  |
Balance, beginning of period |  | $ | 8,000 |  |  | $ | 119 |  |  | $ | 8,143 |  |  | $ | 118 |  |  |  |  |
Current period change for estimated uncollectible reinsurance |  |  |  | 22 |  |  |  |  | 2 |  |  |  |  |
Write-offs of uncollectible reinsurance recoverables |  |  |  | — |  |  |  |  | — |  |  |  |  |
Balance, end of period |  | $ | 8,298 |  |  | $ | 141 |  |  | $ | 8,075 |  |  | $ | 120 |  |  |  |  |
Changes in the allowance for expected credit losses on contractholder receivables [Table Text Block] | The following tables present the balances of contractholder receivables, net of the allowance for expected credit losses, as of September 30, 2025 and 2024, and the changes in the allowance for expected credit losses for the three and nine months ended September 30, 2025 and 2024.
|  | As of and For the Three Months Ended September 30, 2025 |  | As of and For the Three Months Ended September 30, 2024 |  |
(in millions) |  | Contractholder Receivables, Net of Allowance for Expected Credit Losses |  | Allowance for Expected Credit Losses |  | Contractholder Receivables, Net of Allowance for Expected Credit Losses |  | Allowance for Expected Credit Losses |  |  |  |
Balance, beginning of period |  | $ | 3,095 |  |  | $ | 17 |  |  | $ | 3,274 |  |  | $ | 18 |  |  |  |  |
Current period change for expected credit losses |  |  |  | — |  |  |  |  | — |  |  |  |  |
Write-offs of uncollectible contractholder receivables |  |  |  | — |  |  |  |  | — |  |  |  |  |
Balance, end of period |  | $ | 3,098 |  |  | $ | 17 |  |  | $ | 3,292 |  |  | $ | 18 |  |  |  |  |
|  | As of and For the Nine Months Ended September 30, 2025 |  | As of and For the Nine Months Ended September 30, 2024 |  |
(in millions) |  | Contractholder Receivables, Net of Allowance for Expected Credit Losses |  | Allowance for Expected Credit Losses |  | Contractholder Receivables, Net of Allowance for Expected Credit Losses |  | Allowance for Expected Credit Losses |  |  |  |
Balance, beginning of period |  | $ | 3,171 |  |  | $ | 18 |  |  | $ | 3,249 |  |  | $ | 20 |  |  |  |  |
Current period change for expected credit losses |  |  |  | (1) |  |  |  |  | (2) |  |  |  |  |
Write-offs of uncollectible contractholder receivables |  |  |  | — |  |  |  |  | — |  |  |  |  |
Balance, end of period |  | $ | 3,098 |  |  | $ | 17 |  |  | $ | 3,292 |  |  | $ | 18 |  |  |  |  |

X
- Definition Tabular disclosure of allowance for credit loss on contractholder receivables. + References No definition available. + Details
Name: | trv_ContractholderReceivablesAllowanceForCreditLossTableTextBlock
Namespace Prefix: | trv_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CreditLossAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of allowance for credit loss on premium receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_PremiumReceivableAllowanceForCreditLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_ReinsuranceRecoverableAllowanceForCreditLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration