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Borrowings and Other Financing Instruments Bilateral Credit Agreement (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 1,330 | $ 695
Letter of Credit |  |
Short-term Debt [Line Items] |  |
Debt Instrument, Term | 1 year |
Amount outstanding at period end | $ 74 | $ 42
Bilateral Credit Agreement [Member] | NSP-Minnesota | Letter of Credit |  |
Short-term Debt [Line Items] |  |
Debt Instrument, Term | 1 year |
Amount outstanding at period end | $ 69 |
Credit Facility | $ 75 |

X
- Definition Period of time between issuance and maturity of debt instrument, 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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