Long-Term Debt and Liquidity Matters - Estimated Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Estimated fair value of long-term debt, including current maturities
Carrying Amount	$ 7,226,624	$ 7,063,735
Fair Value	7,067,896	7,726,354
APS
Estimated fair value of long-term debt, including current maturities
Carrying Amount	6,267,482	6,266,693
Fair Value	6,131,644	6,933,619
BCE
Estimated fair value of long-term debt, including current maturities
Carrying Amount	11,799	0
Fair Value	12,052	0
Pinnacle West
Estimated fair value of long-term debt, including current maturities
Carrying Amount	947,343	797,042
Fair Value	$ 924,200	$ 792,735