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Commitments and Contingencies NSP-Minnesota-Sherco (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2021 | Sep. 30, 2024 | May 17, 2024
Rate Matters [Abstract] |  |  |
Sherco Disallowance | $ 22 |  |
ALJ Recommended Customer Refund |  |  | $ 34
Disallowance Not Considered in ALJ Recommendation |  |  | $ 22
2011 Sherco Unit 3 Outage Refunds |  | $ 46 |
NSP-Minnesota |  |  |
Rate Matters [Abstract] |  |  |
Customer refund of previously recovered purchased power costs | $ 17 |  |

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