Borrowings and Other Financing Instruments Term Loan Agreement (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Amount outstanding at period end	$ 785	$ 813
Xcel Energy Inc.
Short-term Debt [Line Items]
Amount outstanding at period end	$ 165	$ 231

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant