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Borrowings and Other Financing Instruments Debt Repurchase (Details) - NSP-Minnesota $ in Millions | 6 Months Ended
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Jun. 30, 2025 USD ($)
Debt Disclosure [Abstract] |
Debt Instrument, Repurchased Face Amount | $ 128
Debt Instrument, Repurchase Amount | 81
Gain (Loss) on Repurchase of Debt Instrument | 43
Debt Repurchase [Line Items] |
Debt Instrument, Repurchased Face Amount | 128
Debt Instrument, Repurchase Amount | 81
Gain (Loss) on Repurchase of Debt Instrument | $ 43
Series due March 1, 2050 | Bonds [Member] |
Debt Disclosure [Abstract] |
Debt Instrument, Interest Rate, Stated Percentage | 2.90%
Debt Repurchase [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 2.90%
Series Due June 1, 2051 [Domain] | Bonds [Member] |
Debt Disclosure [Abstract] |
Debt Instrument, Interest Rate, Stated Percentage | 2.60%
Debt Repurchase [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 2.60%
Series due April 1, 2052 | Bonds [Member] |
Debt Disclosure [Abstract] |
Debt Instrument, Interest Rate, Stated Percentage | 3.20%
Debt Repurchase [Line Items] |
Debt Instrument, Interest Rate, Stated Percentage | 3.20%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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- Definition Fair value amount of debt instrument that was repurchased. + References No definition available. + Details
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- Definition Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase. + References No definition available. + Details
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