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Borrowings and Other Financing Instruments Bilateral Credit Agreement (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Short-term Debt [Line Items] |  |  |
Amount outstanding at period end |  | $ 695 | $ 785
Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | 3,550 |
Letter of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Amount outstanding at period end |  | 42 | $ 44
NSP Minnesota | Revolving Credit Facility [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | 700 |
NSP Minnesota | Letter of Credit | Bilateral Credit Agreement [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 75 |
Amount outstanding at period end |  | $ 74 |
[1] | These credit facilities mature in September 2027.

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