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Borrowings and Other Financing Instruments Other Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Dividend Reinvestment Program [Line Items]
Proceeds from Issuance of Common Stock	$ 270	$ 322	$ 366
DividendReinvestmentProgram [Member]
Dividend Reinvestment Program [Line Items]
Proceeds from Issuance of Common Stock	$ 88	$ 84

X

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-14

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

[Line Items] for Dividend Reinvestment Program [Table]

+ References

No definition available.

+ Details

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Namespace Prefix:	xel_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: