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Borrowings and Other Financing Instruments Long-Term Borrowings (Details) - Bonds [Member]	Sep. 30, 2022 USD ($)
PSCo | Series Due June 1, 2032
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 300,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.10%
PSCo | Series Due June 1, 2052
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.50%
SPS | Series Due June 1, 2052
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 200,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.15%
NSP-Wisconsin | Series Due September 15, 2052
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 100,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.86%
NSP-Minnesota | Series Due June 1, 2052
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.50%
XCEL ENERGY INC [Member] | Series Due June 1, 2032
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 700,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.60%

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