Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Income taxes, net of refunds	$ 8,788	$ 46,227	$ 229
Interest, net of amounts capitalized	310,996	245,271	227,584
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Accrued capital expenditures	206,269	114,999	167,733
Dividends declared but not paid	99,813	97,895	95,988
BCE Sale non-cash consideration	28,262	0	0
Arizona Public Service Company
Cash and Cash Equivalents [Line Items]
Income taxes, net of refunds	21,734	95,985	19,783
Interest, net of amounts capitalized	267,261	227,159	217,749
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Accrued capital expenditures	206,269	116,533	167,657
Dividends declared but not paid	$ 99,800	$ 97,900	$ 96,000