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CONSOLIDATED STATEMENTS OF CAPITALIZATION (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2014
Common Stockholder's Equity  
Common stock, shares authorized (in shares) 100us-gaap_CommonStockSharesAuthorized
Common stock, par value (in dollars per share) 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares outstanding (in shares) 100us-gaap_CommonStockSharesOutstanding
First Mortgage Bonds | Series Due April 1, 2014  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueApril12014Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Apr. 01, 2014
First Mortgage Bonds | Series Due Sept. 1, 2017  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 4.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept12017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Sep. 01, 2017
First Mortgage Bonds | Series Due Aug. 1, 2018  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 5.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueAug12018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Aug. 01, 2018
First Mortgage Bonds | Series Due June 1, 2019  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueJune12019Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Jun. 01, 2019
First Mortgage Bonds | Series Due Nov. 15, 2020  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 3.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueNov152020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Nov. 15, 2020
First Mortgage Bonds | Series Due Sept. 15, 2022  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept152022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Sep. 15, 2022
First Mortgage Bonds | Series Due March 15, 2023  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueMarch152023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Mar. 15, 2023
First Mortgage Bonds | Series Due Sept. 1, 2037  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept12037Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Sep. 01, 2037
First Mortgage Bonds | Series Due Aug. 1, 2038  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueAug12038Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Aug. 01, 2038
First Mortgage Bonds | Series Due Aug. 15, 2041  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueAug152041Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Aug. 15, 2041
First Mortgage Bonds | Series Due Sept. 15, 2042  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 3.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueSept152042Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Sep. 15, 2042
First Mortgage Bonds | Series Due March 15, 2043  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 3.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueMarch152043Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Mar. 15, 2043
First Mortgage Bonds | Series Due March 15, 2044  
Schedule of Capitalization, Long-term Debt [Line Items]  
Interest rate, stated percentage (in hundredths) 4.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= psco_SeriesDueMarch152044Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_BondsMember
Debt instrument, maturity date Mar. 15, 2044
Capital Lease Obligations  
Schedule of Capitalization, Long-term Debt [Line Items]  
Debt instrument, interest rate, stated percentage rate range, minimum (in hundredths) 11.20%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
Debt instrument, interest rate, stated percentage rate range, maximum (in hundredths) 14.30%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
Debt instrument, maturity date range, end Dec. 31, 2060