Long-Term Debt and Liquidity Matters (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of estimated fair value of long-term debt, including current maturities

The following table presents the estimated fair value of our long-term debt, including current maturities (dollars in thousands):

	As of September 30, 2018				As of December 31, 2017
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Pinnacle West	$	298,640	$	292,185	$	298,421	$	298,608
APS	4,788,724		4,900,210		4,573,292		5,006,348
Total	$	5,087,364	$	5,192,395	$	4,871,713	$	5,304,956