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EMPLOYEE BENEFIT PLANS
 6 Months Ended
Jun. 30, 2014
Text Block [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS
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 June 30,
 
2014
 
2013
 
2014
 
2013
 
Millions of Dollars
Service Cost
$
2

 
$
3

 
$
1

 
$
1

Interest Cost
5

 
4

 
—

 
1

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

 
—

Actuarial Loss Amortization
1

 
2

 
—

 
—

Net Periodic Benefit Cost
$
3

 
$
4

 
$
1

 
$
2


 
Pension Benefits
 
Other Retiree Benefits
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
 
Millions of Dollars
Service Cost
$
5

 
$
6

 
$
2

 
$
2

Interest Cost
9

 
8

 
1

 
1

Expected Return on Plan Assets
(11
)
 
(10
)
 
—

 
—

Actuarial Loss Amortization
2

 
4

 
—

 
—

Net Periodic Benefit Cost
$
5

 
$
8

 
$
3

 
$
3