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Borrowings and Other Financing Instruments Bilateral Credit Agreement (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Short-term Debt [Line Items] |  |
Amount outstanding at period end | $ 463 | $ 785
Letter of Credit |  |
Short-term Debt [Line Items] |  |
Debt Instrument, Term | 1 year |
Amount outstanding at period end | $ 44 | $ 44
Bilateral Credit Agreement [Member] | NSP-Minnesota | Letter of Credit |  |
Short-term Debt [Line Items] |  |
Debt Instrument, Term | 1 year |
Amount outstanding at period end | $ 65 |
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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- Details
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- Details
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- Details
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