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Borrowings and Other Financing Instruments Long-Term Borrowings (Details) shares in Thousands	Nov. 30, 2024 shares
Forward Equity Agreements
Forward Contract Indexed to Issuer's Equity [Line Items]
Common Stock, Shares to be Issued through forward Equity Agreement	21,100

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

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- Definition

Common Stock, Shares, to be issued through Forward Equity Agreement

+ References

No definition available.

+ Details

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Namespace Prefix:	xel_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	xel_ShareIssuanceProgramAxis=xel_ForwardEquityAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: