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Borrowings and Other Financing Instruments Long-Term Borrowings (Details) - Bonds [Member] - USD ($) | Jul. 15, 2022 | Jun. 30, 2022
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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 | Subsequent Event [Member] |  |
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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