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Commitments and Contingencies NSP-Minnesota-Sherco (Details) - USD ($) $ in Millions | 1 Months Ended |
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Jan. 31, 2021 | Sep. 22, 2023
Rate Matters [Abstract] |  |
Sherco Dissallowance | $ 22 |
NSP-Minnesota |  |
Rate Matters [Abstract] |  |
Customer refund of previously recovered purchased power costs | $ 17 |
DOC Recommendation Based on Xcel's GE Litigation Loss of Use |  | $ 56

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