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Revenue from Contracts with Customers - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($)
Revenue from Contract with Customer [Abstract] |
Deferred revenue recognized in other income | $ (1.6)
Contracts with customers accounts receivable | 2.7
Contracts with customers deferred costs | 3.0
Contracts with customers deferred revenue | $ 22.8

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Contract With Customer, Accounts Receivable + References No definition available. + Details
Name: | wbs_ContractWithCustomerAccountsReceivable
Namespace Prefix: | wbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract With Customer, Deferred Costs + References No definition available. + Details
Name: | wbs_ContractWithCustomerDeferredCosts
Namespace Prefix: | wbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract With Customer, Deferred Revenue + References No definition available. + Details
Name: | wbs_ContractWithCustomerDeferredRevenue
Namespace Prefix: | wbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant