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Revenues
 9 Months Ended
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]  
Revenue
Revenue is classified by the type of goods/services rendered and market/customer type. SPS’ operating revenues consisted of the following:
Three Months Ended Sept. 30
(Millions of Dollars)20232022
Major revenue types
Revenue from contracts with customers:
Residential$164 $159 
Commercial and Industrial319 325 
Other18 17 
Total retail501 501 
Wholesale88 149 
Transmission81 80 
Total revenue from contracts with customers670 730 
Alternative revenue and other7 11 
Total revenues$677 $741 
Nine Months Ended Sept. 30
(Millions of Dollars)20232022
Major revenue types
Revenue from contracts with customers:
Residential$356 $356 
Commercial and Industrial843 811 
Other44 38 
Total retail1,243 1,205 
Wholesale184 327 
Transmission227 226 
Other2 6 
Total revenue from contracts with customers1,656 1,764 
Alternative revenue and other25 112 
Total revenues$1,681 $1,876