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BUSINESS SEGMENTS
 3 Months Ended
Mar. 31, 2014
Text Block [Abstract]  
BUSINESS SEGMENTS
BUSINESS SEGMENTS
We have three reportable segments regularly reviewed by our chief operating decision makers to evaluate performance and make operating decisions.
(1)
TEP, a regulated electric utility and our largest subsidiary
(2)
UNS Electric, a regulated electric utility
(3)
UNS Gas, a regulated gas distribution utility
We disclose selected financial data for our reportable segments in the following tables:
 
Reportable Segments
 
 
 
 
 
 
 
TEP
 
UNS Electric
 
UNS Gas
 
Other (2)
 
Reconciling
Adjustments
 
UNS
Energy
 
Millions of Dollars
Three Months Ended March 31, 2014:
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues-External
$
252

 
$
40

 
$
41

 
$
—

 
$
—

 
$
333

Operating Revenues-Intersegment (1)
4

 
1

 
—

 
4

 
(9
)
 
—

Income Before Income Taxes
15

 
3

 
8

 
(1
)
 
—

 
25

Net Income
9

 
2

 
5

 
(1
)
 
—

 
15

 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2013:
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues-External
$
244

 
$
36

 
$
52

 
$
—

 
$
—

 
$
332

Operating Revenues-Intersegment (1)
4

 
1

 
—

 
4

 
(9
)
 
—

Income Before Income Taxes
3

 
4

 
12

 
—

 
—

 
19

Net Income
1

 
2

 
8

 
—

 
—

 
11

(1) 
Operating Revenues-Intersegment includes common costs (system, facilities, etc.) allocated to affiliates on a cost-causative basis and recorded as revenue by TEP, sales of power between TEP and UNS Electric at third-party market prices, control area services provided by TEP to UNS Electric based on a FERC-approved tariff, sales of gas by UNS Gas at third-party market prices for use in UNS Electric's generating facilities, and supplemental workforce charges (primarily meter reading services) provided to the utilities by an unregulated affiliate.
(2) 
Other includes the UNS Energy and UES holding companies, Millennium, and UED.