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Borrowings and Other Financing Instruments (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Money Pool [Table Text Block]
Money pool borrowings for SPS were as follows:
(Millions of Dollars, Except Interest Rates)Three Months Ended Dec. 31, 2020Year Ended Dec. 31
202020192018
Borrowing limit$100 $100 $100 $100 
Amount outstanding at period end— — — — 
Average amount outstanding81 43 8 29 
Maximum amount outstanding100 100 100 100 
Weighted average interest rate, computed on a daily basis0.08 %0.54 %2.42 %1.96 %
Weighted average interest rate at end of periodN/AN/AN/AN/A
Short-Term Borrowings Commercial paper outstanding for SPS was as follows:
(Millions of Dollars, Except Interest Rates)Three Months Ended Dec. 31, 2020Year Ended Dec. 31
202020192018
Borrowing limit$500 $500 $500 $400 
Amount outstanding at period end250 250 — 42 
Average amount outstanding58 44 72 30 
Maximum amount outstanding250 250 316 144 
Weighted average interest rate, computed on a daily basis0.21 %1.11 %2.68 %2.27 %
Weighted average interest rate at end of period0.29 0.29 N/A2.80 
Schedule Of Debt To Total Capitalization Ratio [Table Text Block]
Features of SPS’ credit facility:
Debt-to-Total Capitalization Ratio (a)
Amount Facility May Be Increased (millions)
Additional Periods for Which a One-Year Extension May Be Requested (b)
20202019
48%46%$502
(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. 		[1],[2]
Credit Facilities
SPS had the following committed credit facility available as of Dec. 31, 2020.
Credit Facility (a)
Drawn (b)
Available
$500$252$248
(a)This credit facility matures in June 2024.
(b)Includes letters of credit and outstanding commercial paper.
 [3],[4]
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt obligations for SPS as of Dec. 31 (millions of dollars):
Financing InstrumentInterest RateMaturity Date20202019
First mortgage bonds3.30 %June 15, 2024$150 $150 
First mortgage bonds3.30 June 15, 2024200 200 
Unsecured senior notes6.00 Oct. 1, 2033100 100 
Unsecured senior notes6.00 Oct. 1, 2036250 250 
First mortgage bonds4.50 Aug. 15, 2041200 200 
First mortgage bonds4.50 Aug. 15, 2041100 100 
First mortgage bonds4.50 Aug. 15, 2041100 100 
First mortgage bonds3.40 Aug. 15, 2046300 300 
First mortgage bonds3.70 Aug. 15, 2047450 450 
First mortgage bonds4.40 Nov. 15, 2048300 300 
First mortgage bonds (b)
3.75 June 15, 2049300 300 
First mortgage bonds (a)
3.15 May 1, 2050350 — 
Unamortized discount(10)(7)
Unamortized debt issuance cost(26)(23)
Total long-term debt$2,764 $2,420 
(a)2020 financing.
(b)2019 financing.
 [5],[6]
Schedule of Maturities of Long-term Debt [Table Text Block]
Maturities of long-term debt:
(Millions of Dollars)
2021$— 
2022— 
2023— 
2024350 
2025— 
Schedule of Stock by Class [Table Text Block] SPS has the following preferred stock:
Preferred Stock Authorized (Shares)Par Value of Preferred StockPreferred Stock Outstanding (Shares) 2020 and 2019
10,000,000 1.00 — 
Dividend Payment Restrictions [Text Block]
Requirements and actuals as of Dec. 31, 2020:
Equity to Total Capitalization Ratio
Required Range
Equity to Total Capitalization Ratio Actual (a)
LowHigh2020
45.0 %55.0 %54.4 %
(a)    Excludes short-term debt.
Unrestricted Retained EarningsTotal Capitalization
Limit on Total Capitalization (a)
$510  million$6 billionN/A
(a) SPS may not pay a dividend that would cause it to lose its investment grade bond rating.
[1] All extension requests are subject to majority bank group approval.
[2] The credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.
[3] Includes letters of credit and outstanding commercial paper.
[4] This credit facility matures in June 2024.
[5] 2019 financing
[6] 2020 financing