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Borrowings and Other Financing Instruments (Tables)
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Money Pool [Table Text Block]
Money pool borrowings:
(Millions of Dollars, Except Interest Rates)Three Months Ended Dec. 31, 2023Year Ended Dec. 31
202320222021
Borrowing limit$250 $250 $250 $250 
Amount outstanding at period end51 51 — — 
Average amount outstanding64 23 29 12 
Maximum amount outstanding250 250 250 243 
Weighted average interest rate, computed on a daily basis5.33 %5.31 %1.66 %0.07 %
Weighted average interest rate at end of period5.34 5.34 N/AN/A
Schedule of Short-term Debt [Table Text Block] Commercial paper borrowings:
(Millions of Dollars, Except Interest Rates)Three Months Ended Dec. 31, 2023Year Ended Dec. 31
202320222021
Borrowing limit$700 $700 $700 $700 
Amount outstanding at period end320 320 294 147 
Average amount outstanding189 124 71 26 
Maximum amount outstanding369 454 328 322 
Weighted average interest rate, computed on a daily basis5.53 %5.17 %2.56 %0.19 %
Weighted average interest rate at end of period5.56 5.56 4.73 0.22 
Schedule Of Debt To Total Capitalization Ratio [Table Text Block]
Debt-to-Total Capitalization Ratio (a)
Amount Facility May Be Increased (millions of dollars)
Additional Periods for Which a One-Year Extension May Be Requested (b)
20232022
44.8 %44.0 %$100 2
(a)The credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.
(b)All extension requests are subject to majority bank group approval.
Schedule of Line of Credit Facilities [Table Text Block]
PSCo had the following committed credit facility available as of Dec. 31, 2023 (in millions of dollars):
Credit Facility (a)
Drawn (b)
Available
$700 $349 $351 
(a)This credit facility matures in September 2027.
(b)Includes letters of credit and outstanding commercial paper.
 [1],[2]
Schedule of Capitalization [Table Text Block]
Long-term debt obligations for PSCo as of Dec. 31 (in millions of dollars):
Financing InstrumentInterest RateMaturity Date20232022
First mortgage bonds2.50 %March 15, 2023$— $250 
First mortgage bonds2.90 May 15, 2025250 250 
First mortgage bonds3.70 June 15, 2028350 350 
First mortgage bonds1.90 Jan. 15, 2031375 375 
First mortgage bonds 1.875 June 15, 2031750 750 
First mortgage bonds (a)
4.10 June 1, 2032300 300 
First mortgage bonds6.25 Sept. 1, 2037350 350 
First mortgage bonds6.50 Aug. 1, 2038300 300 
First mortgage bonds4.75 Aug. 15, 2041250 250 
First mortgage bonds3.60 Sept. 15, 2042500 500 
First mortgage bonds3.95 March 15, 2043250 250 
First mortgage bonds4.30 March 15, 2044300 300 
First mortgage bonds3.55 June 15, 2046250 250 
First mortgage bonds3.80 June 15, 2047400 400 
First mortgage bonds4.10 June 15, 2048350 350 
First mortgage bonds4.05 Sept. 15, 2049400 400 
First mortgage bonds3.20 March 1, 2050550 550 
First mortgage bonds2.70 Jan. 15, 2051375 375 
First mortgage bonds (a)
4.50 June 1, 2052400 400 
First mortgage bonds (b)
5.25 April 1, 2053850 — 
Unamortized discount(41)(37)
Unamortized debt issuance cost(59)(53)
Current maturities— (250)
Total long-term debt$7,450 $6,610 
(a)2022 financing.
(b)2023 financing.
 [3],[4]
Schedule of Maturities of Long-term Debt [Table Text Block]
Maturities of long-term debt:
(Millions of Dollars)
2024$— 
2025250 
2026— 
2027— 
2028350 
Preferred Stock
Capital Stock — PSCo has authorized the issuance of preferred stock.
Preferred Stock Authorized (Shares)Par Value of Preferred StockPreferred Stock Outstanding (Shares) 2023 and 2022
10,000,000 $0.01 — 
[1] Includes letters of credit and outstanding commercial paper.
[2] This credit facility matures in September 2027.
[3] 2022 financing
[4] 2023 financing.