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Borrowings and Other Financing Instruments Term Loan (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Short-term Debt [Line Items] |  |  |
Amount outstanding at period end | $ 95 |  | $ 785
Proceeds from issuance of common stock | 1,109 | $ 83 |
ATM Net Proceeds | 1,100 |  | 188
Letter of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Amount outstanding at period end | $ 43 |  | $ 44
Series Due March 15, 2034 | Bonds [Member] | XCEL ENERGY INC [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.50% |  |
Debt Instrument, Face Amount | $ 800 |  |
Series Due May 15, 2034 | Bonds [Member] | PSCo |  |  |
Short-term Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.35% |  |
Debt Instrument, Face Amount | $ 450 |  |
Series Due March 15, 2054 | Bonds [Member] | NSP-Minnesota |  |  |
Short-term Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.40% |  |
Debt Instrument, Face Amount | $ 700 |  |
Series Due May 15, 2054 | Bonds [Member] | PSCo |  |  |
Short-term Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |
Debt Instrument, Face Amount | $ 750 |  |
Series Due June 15, 2054 | Bonds [Member] | NSP-Wisconsin |  |  |
Short-term Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.65% |  |
Debt Instrument, Face Amount | $ 400 |  |
Series Due June 1, 2054 | Bonds [Member] | SPS |  |  |
Short-term Debt [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |  |
Debt Instrument, Face Amount | $ 600 |  |

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