XML 69 R59.htm IDEA: XBRL DOCUMENT
v3.23.1

Commitments and Contingencies Environmental Requirements - Water and Waste (Details) $ in Millions | Mar. 31, 2023 USD ($) Period
--- | ---
Federal Coal Ash Regulation |
Site Contingency [Line Items] |
Number of sites where regulated ash units will still be in operation at a specified date | Period | 8
Federal Coal Ash Regulation | PSCo |
Site Contingency [Line Items] |
Estimated cost to remediate groundwater sampling results | $ 30
Federal Coal Ash Regulation | PSCo | Maximum [Member] |
Site Contingency [Line Items] |
Cost of Beneficial Use Coal Ash Project | 45
Federal Clean Water Act Section 316 (b) | Capital Addition Purchase Commitments |
Site Contingency [Line Items] |
Liability for estimated cost to comply with regulation | $ 45

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_SiteContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost of Beneficial Use Coal Ash Project + References No definition available. + Details
Name: | xel_CostOfBeneficialUseCoalAshProject
Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated cost to remediate groundwater sampling results + References No definition available. + Details
Name: | xel_EstimatedCostToRemediateGroundwaterSamplingResults
Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Estimated undiscounted amount of the accrual required to comply with required regulation. + References No definition available. + Details
Name: | xel_LiabilityForEstimatedCostToComplyWithRegulation
Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of sites where regulated ash units will still be in operation at a specified date + References No definition available. + Details
Name: | xel_Numberofsiteswhereregulatedashunitswillstillbeinoperationataspecifieddate
Namespace Prefix: | xel_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | xel_EnvironmentalRegulationAxis=xel_FederalCoalAshRegulationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=xel_PscoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | xel_EnvironmentalRegulationAxis=xel_FederalCleanWaterActSection316bMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=us-gaap_CapitalAdditionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |