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Borrowings and Other Financing Instruments Long-Term Borrowings (Details) - Bonds [Member] $ in Millions	Sep. 30, 2025 USD ($)
Series Due May 15, 2034 | PSCo
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Face Amount	$ 400
Debt Instrument, Interest Rate, Stated Percentage	5.35%
Series due May 15, 2035 | NSP-Minnesota
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Face Amount	$ 600
Debt Instrument, Interest Rate, Stated Percentage	5.05%
Series due May 15, 2035 | SPS
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Face Amount	$ 500
Debt Instrument, Interest Rate, Stated Percentage	5.30%
Series Due May 15, 2055 | PSCo
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Face Amount	$ 800
Debt Instrument, Interest Rate, Stated Percentage	5.85%
Series Due May 15, 2055 | NSP-Minnesota
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Face Amount	$ 500
Debt Instrument, Interest Rate, Stated Percentage	5.65%
Series Due June 15, 2054 | NSP-Wisconsin
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Face Amount	$ 250
Debt Instrument, Interest Rate, Stated Percentage	5.65%
Series Due March 21, 2028 | XCEL ENERGY INC [Member]
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Face Amount	$ 350
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Series Due April 15, 2035 | XCEL ENERGY INC [Member]
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Face Amount	$ 750
Debt Instrument, Interest Rate, Stated Percentage	5.60%
Series Due October 15, 2085 | XCEL ENERGY INC [Member]
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Face Amount	$ 900
6.25% Junior Subordinated Notes due 2085 [Member] | XCEL ENERGY INC [Member]
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Series Due September 15, 2035 | PSCo
Forward Contract Indexed to Issuer's Equity [Line Items]
Debt Instrument, Face Amount	$ 800
Debt Instrument, Interest Rate, Stated Percentage	5.15%

X

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Face (par) amount of debt instrument at time of issuance.

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-Name Accounting Standards Codification
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