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Borrowings and Other Financing Instruments Long-Term Borrowings (Details) - Bonds [Member] - USD ($) $ in Millions	Apr. 04, 2024	Mar. 31, 2024
PSCo | Series Due May 15, 2034 | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 450
Debt Instrument, Interest Rate, Stated Percentage	5.35%
PSCo | Series Due May 15, 2054 | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 750
Debt Instrument, Interest Rate, Stated Percentage	5.75%
NSP-Minnesota | Series Due March 15, 2054
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 700
Debt Instrument, Interest Rate, Stated Percentage		5.40%
XCEL ENERGY INC [Member] | Series Due March 15, 2034
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 800
Debt Instrument, Interest Rate, Stated Percentage		5.50%

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