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Benefit Plans and Other Postretirement Benefits Plan Amendments (Details) | Dec. 31, 2023 USD ($)
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Defined Benefit Plan Disclosure [Line Items] |
plan ammendment | $ 0

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition plan amendment + References No definition available. + Details
Name: | xel_PlanAmendment
Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant