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Long-Term Debt and Liquidity Matters (Tables)
9 Months Ended
Sep. 30, 2014
Debt Disclosure [Abstract]  
Schedule of estimated fair value of long-term debt, including current maturities
The following table represents the estimated fair value of our long-term debt, including current maturities (dollars in millions):

 
As of September 30, 2014
 
As of December 31, 2013
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
Pinnacle West
$
125

 
$
125

 
$
125

 
$
125

APS
3,282

 
3,662

 
3,212

 
3,454

Total
$
3,407

 
$
3,787

 
$
3,337

 
$
3,579