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Commitments and Contingencies - Winter Storm Uri (Details) $ in Millions	Jun. 30, 2022 USD ($)
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