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Commitments and Contingencies (Details) - Westmoreland $ in Millions	Jun. 30, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Westmoreland Recovery	$ 19

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

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- Definition

Westmoreland Recovery

+ References

No definition available.

+ Details

Name:	xel_WestmorelandRecovery
Namespace Prefix:	xel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant