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Borrowings and Other Financing Instruments Long-Term Borrowings (Details) - PSCo - Bonds [Member] $ in Millions	Mar. 31, 2023 USD ($)
Series Due April 1, 2052
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 125
Debt Instrument, Interest Rate, Stated Percentage	5.30%
Series Due April 1, 2053
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 850
Debt Instrument, Interest Rate, Stated Percentage	5.25%

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- Definition

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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