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Commitments and Contingencies Sherco (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2021 | Dec. 31, 2023 | Jan. 27, 2021
Public Utilities, General Disclosures [Line Items] |  |  |
Customer refund of previously recovered purchased power costs | $ 17 |  |
Amount MPUC previously disallowed related to Sherco outage |  |  | $ 22
DOC recommended refund |  | $ 56 |
Recommended refund |  | $ 72 |

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