Long-Term Debt and Liquidity Matters - Estimated Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Estimated fair value of long-term debt, including current maturities
Carrying Amount	$ 7,241,295	$ 7,063,735
Fair Value	6,423,551	7,726,354
APS
Estimated fair value of long-term debt, including current maturities
Carrying Amount	6,268,271	6,266,693
Fair Value	5,488,229	6,933,619
BCE
Estimated fair value of long-term debt, including current maturities
Carrying Amount	25,477	0
Fair Value	25,802	0
Pinnacle West
Estimated fair value of long-term debt, including current maturities
Carrying Amount	947,547	797,042
Fair Value	$ 909,520	$ 792,735