Long-Term Debt and Liquidity Matters - Estimated Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Estimated fair value of long-term debt, including current maturities
Carrying Amount	$ 7,977,375	$ 7,791,971
Fair Value	7,043,443	6,585,701
APS
Estimated fair value of long-term debt, including current maturities
Carrying Amount	6,794,124	6,793,529
Fair Value	5,898,167	5,629,491
BCE
Estimated fair value of long-term debt, including current maturities
Carrying Amount	60,150	50,550
Fair Value	60,821	50,685
Pinnacle West
Estimated fair value of long-term debt, including current maturities
Carrying Amount	1,123,101	947,892
Fair Value	$ 1,084,455	$ 905,525