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Commitments and Contingencies NSP-Minnesota-Sherco (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2021 | Mar. 31, 2024 | Sep. 22, 2023
Rate Matters [Abstract] |  |  |
Sherco Disallowance | $ 22 |  |
Sherco Large Industrial Customer group recommended refund |  | $ 72 |
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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