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REVENUE (Tables)
 6 Months Ended
Jun. 30, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue The following table presents the disaggregation of TEP’s Operating Revenues on the Condensed Consolidated Statements of Income by type of service:
Three Months Ended June 30,Six Months Ended June 30,
(in millions)2025202420252024
Retail$315 $334 $560 $616 
Wholesale47 51 105 140 
Other Services26 27 49 66 
Revenues from Contracts with Customers388 412 714 822 
Alternative Revenues12 11 24 19 
Other7 7 35 41 
Total Operating Revenues$407 $430 $773 $882