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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2013
Text Block [Abstract]  
Components of Net Periodic Benefit Cost
UNS Energy’s net periodic benefit plan cost, comprised primarily of TEP's cost, includes the following components:
 
Pension Benefits
 
Other Retiree Benefits
 
Three Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
 
Millions of Dollars
 
 
 
 
 
 
 
 
Service Cost
$
4

 
$
2

 
$
1

 
$
1

Interest Cost
4

 
4

 
—

 
1

Expected Return on Plan Assets
(5
)
 
(4
)
 
—

 
—

Actuarial Loss Amortization
2

 
2

 
—

 
—

Net Periodic Benefit Cost
$
5

 
$
4

 
$
1

 
$
2


 
Pension Benefits
 
Other Retiree Benefits
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
 
Millions of Dollars
 
 
 
 
 
 
 
 
Service Cost
$
10

 
$
8

 
$
3

 
$
2

Interest Cost
11

 
12

 
2

 
2

Expected Return on Plan Assets
(15
)
 
(13
)
 
(1
)
 
—

Actuarial Loss Amortization
7

 
5

 
—

 
—

Net Periodic Benefit Cost
$
13

 
$
12

 
$
4

 
$
4