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Borrowings and Other Financing Instruments (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Money Pool [Table Text Block]
Money pool borrowings:
(Millions of Dollars, Except Interest Rates)Three Months Ended Dec. 31, 2022Year Ended Dec. 31
202220212020
Borrowing limit$250 $250 $250 $250 
Amount outstanding at period end— — — 57 
Average amount outstanding21 29 12 59 
Maximum amount outstanding165 250 243 250 
Weighted average interest rate, computed on a daily basis3.12 %1.66 %0.07 %0.60 %
Weighted average interest rate at end of periodN/AN/AN/A0.70 
Schedule of Short-term Debt [Table Text Block] Commercial paper borrowings:
(Millions of Dollars, Except Interest Rates)Three Months Ended Dec. 31, 2022Year Ended Dec. 31
202220212020
Borrowing limit$700 $700 $700 $700 
Amount outstanding at period end294 294 147 136 
Average amount outstanding155 71 26 30 
Maximum amount outstanding294 328 322 230 
Weighted average interest rate, computed on a daily basis4.24 %2.56 %0.19 %1.59 %
Weighted average interest rate at end of period4.73 4.73 0.22 0.20 
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)
20222021
44 %44 %$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] (in millions of dollars):
Credit Facility (a)
Drawn (b)
Available
$700 $321 $379 
(a)This credit facility matures in September 2027.
(b)Includes letters of credit and outstanding commercial paper.
 [1],[2]
Schedule of Capitalization [Table Text Block]
Long-term debt obligations for PSCo as of Dec. 31 (in millions of dollars):
Financing InstrumentInterest RateMaturity Date20222021
First mortgage bonds2.25 %Sept. 15, 2022$— $300 
First mortgage bonds2.50 March 15, 2023250 250 
First mortgage bonds2.90 May 15, 2025250 250 
First mortgage bonds 3.70 June 15, 2028350 350 
First mortgage bonds1.90 Jan. 15, 2031375 375 
First mortgage bonds (a)
1.875 June 15, 2031750 750 
First mortgage bonds (b)
4.10 June 1, 2032300 — 
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 (b)
4.50 June 1, 2052400 — 
Unamortized discount(37)(33)
Unamortized debt issuance cost(53)(50)
Current maturities(250)(300)
Total long-term debt$6,610 $6,167 
(a)2021 financing.
(b)2022 financing.
 [3],[4]
Schedule of Maturities of Long-term Debt [Table Text Block]
Maturities of long-term debt:
(Millions of Dollars)
2023$250 
2024— 
2025250 
2026— 
2027— 
Preferred Stock
Capital Stock — PSCo has authorized the issuance of preferred stock.
Preferred Stock Authorized (Shares)Par Value of Preferred StockPreferred Stock Outstanding (Shares) 2022 and 2021
10,000,000 $0.01 — 
[1] Includes letters of credit and outstanding commercial paper.
[2] This credit facility matures in September 2027.
[3] 2021 financing
[4] 2022 financing.