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Borrowings and Other Financing Instruments Letters of Credit (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Line of Credit Facility [Line Items] |  |  |
Amount outstanding at period end |  | $ 785 | $ 813
Xcel Energy Inc. |  |  |
Line of Credit Facility [Line Items] |  |  |
Amount outstanding at period end |  | $ 165 | $ 231
Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Expiration Period |  | 1 year |
Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | $ 3,550 |
Revolving Credit Facility [Member] | Xcel Energy Inc. |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | $ 1,500 |
[1] | These credit facilities mature in September 2027.

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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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