REVENUE (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

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 September 30,				Nine Months Ended September 30,
(in millions)	2018		2017		2018		2017
Retail	$	345	$	334	$	810	$	801
Wholesale	79		44		152		116
Other Services	24		27		74		71
Revenues from Contracts with Customers	448		405		1,036		988
Alternative Revenues	5		6		20		19
Other	7		6		33		31
Total Operating Revenues	$	460	$	417	$	1,089	$	1,038