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Commitments and Contingencies (Details) - PI Outage Prudency Review - USD ($) $ in Millions | Jun. 30, 2025 | May 01, 2025
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Commitments and Contingencies Disclosure [Abstract] |  |
NSP testimony - Prairie Island Outage Prudency Review |  | $ 6
NSP-Minnesota estimated refund - PI Outage Prudency Review | $ 34 |

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