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Variable Interest Entities (Details) - MW	Sep. 30, 2022	Dec. 31, 2021
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Variable Interest Entity [Line Items]
Generating capacity under long term purchased power agreements (in MW)	3,961	4,062

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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

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- Definition

Generating capacity under long-term purchased power agreements.

+ References

No definition available.

+ Details

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Namespace Prefix:	xel_
Data Type:	dtr-types:powerItemType
Balance Type:	na
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: