XML 72 R62.htm IDEA: XBRL DOCUMENT
v3.23.3

MGP, Landfill and Disposal Sites (Details) | Sep. 30, 2023
--- | ---
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 | 12

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: |