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Lines of Credit and Short-Term Borrowings (Tables)
 12 Months Ended
Dec. 31, 2017
Lines of Credit and Short-Term Borrowings  
Schedule of consolidated credit facilities and amounts available and outstanding
The table below presents the consolidated credit facilities and the amounts available and outstanding as of December 31, 2017 and 2016 (dollars in thousands):
 
 
December 31, 2017
 
December 31, 2016
 
Pinnacle West
APS
Total
 
Pinnacle West
APS
Total
Commitments under Credit Facilities
$
325,000

$
1,000,000

$
1,325,000

 
$
275,000

$
1,000,000

$
1,275,000

Outstanding Commercial Paper and Revolving Credit Facility Borrowings
(95,400
)
—

(95,400
)
 
(41,700
)
(135,500
)
(177,200
)
Amount of Credit Facilities Available
$
229,600

$
1,000,000

$
1,229,600

 
$
233,300

$
864,500

$
1,097,800

 
 
 
 
 
 
 
 
Weighted-Average Commitment Fees
0.125%
0.100%
 
 
0.125%
0.100%