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QUARTERLY FINANCIAL DATA (UNAUDITED)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
QUARTERLY FINANCIAL DATA (UNAUDITED) QUARTERLY FINANCIAL DATA (UNAUDITED)
TEP's quarterly financial information is unaudited, but, in management’s opinion, includes all adjustments necessary for a fair presentation. TEP's utility business is seasonal in nature. Peak sales periods for TEP generally occur during the summer. Accordingly, comparisons among quarters of a year may not represent overall trends and changes in operations.
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
(in millions)
2019
Operating Revenue
$
333

 
$
326

 
$
441

 
$
318

Operating Income
43

 
67

 
134

 
39

Net Income
26

 
42

 
98

 
21

 
 
 
 
 
 
 
 
 
2018
Operating Revenue
$
275

 
$
354

 
$
460

 
$
344

Operating Income
43

 
83

 
126

 
36

Net Income
24

 
58

 
95

 
11