REVENUE (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The following table presents the disaggregation of TEP’s Operating Revenues on the Consolidated Statements of Income by type of service:

	Years Ended December 31,
(in millions)	2019		2018		2017
Retail	$	972	$	1,022	$	1,017
Wholesale	247		238		152
Other Services	124		100		103
Revenues from Contracts with Customers	1,343		1,360		1,272
Alternative Revenues	35		28		24
Other	40		45		45
Total Operating Revenues	$	1,418	$	1,433	$	1,341