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VIEs - PPAs (Details) - MW	Dec. 31, 2023	Dec. 31, 2022
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

X

- 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

X

- Details

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