Long-Term Debt and Liquidity Matters - Estimated Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Estimated fair value of long-term debt, including current maturities
Carrying Amount	$ 7,371,833	$ 7,063,735
Fair Value	6,093,147	7,726,354
APS
Estimated fair value of long-term debt, including current maturities
Carrying Amount	6,396,740	6,266,693
Fair Value	5,167,359	6,933,619
BCE
Estimated fair value of long-term debt, including current maturities
Carrying Amount	27,341	0
Fair Value	27,628	0
Pinnacle West
Estimated fair value of long-term debt, including current maturities
Carrying Amount	947,752	797,042
Fair Value	$ 898,160	$ 792,735