Long-Term Debt and Liquidity Matters - Estimated Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Estimated fair value of long-term debt, including current maturities
Carrying Amount	$ 8,483,222	$ 7,791,971
Fair Value	7,417,875	6,585,701
APS
Estimated fair value of long-term debt, including current maturities
Carrying Amount	7,291,004	6,793,529
Fair Value	6,267,348	5,629,491
BCE
Estimated fair value of long-term debt, including current maturities
Carrying Amount	68,907	50,550
Fair Value	68,907	50,685
Pinnacle West
Estimated fair value of long-term debt, including current maturities
Carrying Amount	1,123,311	947,892
Fair Value	$ 1,081,620	$ 905,525