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MGP, Landfill and Disposal Sites (Details) $ in Millions | Sep. 30, 2024 USD ($)
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Manufactured Gas Plant (MGP) Site [Abstract] |
Cost of identified MGP, landfill, or disposal sites under current investigation and/or remediation | $ 20
Other MGP, Landfill, or Disposal Sites [Domain] |
Manufactured Gas Plant (MGP) Site [Abstract] |
Number of identified MGP, landfill, or disposal sites under current investigation and/or remediation | 13

X
- Definition Cost of identified MGP, landfill, or disposal sites under current investigation and/or remediation + References No definition available. + Details
Name: | xel_CostOfIdentifiedMGPLandfillOrDisposalSitesUnderCurrentInvestigationAndorRemediation
Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | xel_ManufacturedGasPlantMgpSitesAbstract
Namespace Prefix: | xel_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | xel_NumberofidentifiedMGPlandfillordisposalsitesundercurrentinvestigationandorremediation
Namespace Prefix: | xel_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=xel_OtherMGPLandfillOrDisposalSitesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |