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

-- None. No documentation exists for this element. --

No definition available.

Name:	xel_ManufacturedGasPlantMgpSitesAbstract
Namespace Prefix:	xel_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration