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VIEs - PPAs (Details) - MW | Dec. 31, 2023 | Dec. 31, 2022
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Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |
Purchased Power Agreements [Abstract] |  |
Generating capacity (in MW) | 3,751 | 3,961

X
- Definition Generating capacity under long-term purchased power agreements. + References No definition available. + Details
Name: | xel_GeneratingCapacityUnderLongTermPurchasedPowerAgreements
Namespace Prefix: | xel_
Data Type: | dtr-types1:powerItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |