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REVENUE
 6 Months Ended
Jun. 30, 2023
Revenue from Contract with Customer [Abstract]  
REVENUE REVENUE
DISAGGREGATION OF REVENUES
TEP earns most of its revenues from the sale of power to retail and wholesale customers based on regulator-approved tariff rates. 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)2023202220232022
Retail$297 $306 $530 $524 
Wholesale (1)
64 99 190 155 
Other Services39 23 70 47 
Revenues from Contracts with Customers400 428 790 726 
Alternative Revenues8 2 21 13 
Other10 10 43 37 
Total Operating Revenues$418 $440 $854 $776 
(1)In 2022, the FERC issued the 2022 Final FERC Rate Order approving TEP's proposed OATT revisions. Prior to July 2022, wholesale revenues excluded an estimate of revenues probable of refund.