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Borrowings and Other Financing Instruments Debt Repurchase (Details) - NSP-Minnesota $ in Millions	6 Months Ended
	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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Contractual interest rate for funds borrowed, under the debt agreement.

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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

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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.

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