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Commitments and Contingencies - Winter Storm Uri (Details) $ in Millions | Jun. 30, 2022 USD ($)
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Loss Contingencies [Line Items] |
Winter Storm Uri Costs | $ 148

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

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- Definition Winter Storm Uri Costs + References No definition available. + Details
Name: | xel_WinterStormUriCosts
Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant