Long-Term Debt and Liquidity Matters (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2018				As of December 31, 2017
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Pinnacle West	$	298,326	$	293,061	$	298,421	$	298,608
APS	4,574,207		4,845,665		4,573,292		5,006,348
Total	$	4,872,533	$	5,138,726	$	4,871,713	$	5,304,956