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Borrowings and Other Financing Instruments Deferred Financing Costs (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred Financing Costs [Abstract]
Deferred Finance Costs, Noncurrent, Net	$ 209	$ 193

X

- Definition

Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482925/835-30-45-3

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Deferred Financing Costs [Abstract]

+ References

No definition available.

+ Details

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