Long-Term Debt and Liquidity Matters - Narrative (Details)					3 Months Ended
	Apr. 19, 2024 USD ($)	Feb. 09, 2024 USD ($)	Dec. 12, 2023 USD ($)	Feb. 11, 2022 USD ($) MW	Mar. 31, 2024 USD ($) shares	Oct. 27, 2023 USD ($)	Aug. 04, 2023 USD ($)	Apr. 10, 2023 USD ($) creditFacility	Apr. 09, 2023 USD ($)	Dec. 15, 2022 USD ($)	Dec. 14, 2022 USD ($)
APS
Long-Term Debt and Liquidity Matters
Annual amount of approved equity infusions					$ 150,000,000
Increased in equity contributions						$ 500,000,000
APS | Subsequent Event
Long-Term Debt and Liquidity Matters
Public utilities, request to permanently modify permitted yearly equity infusions	2.50%
APS | ACC
Long-Term Debt and Liquidity Matters
Public utility order short term debt authorization as percentage of capitalization										7.00%
Public utility order short term debt authorization, fixed amount										$ 500,000,000
Public utility order long term debt, authorization					$ 8,000,000,000					$ 8,000,000,000	$ 7,500,000,000
APS | ACC | Subsequent Event
Long-Term Debt and Liquidity Matters
Public utility order long term debt, increase in authorization limit	$ 9,500,000,000
BCE
Long-Term Debt and Liquidity Matters
Solar plant capacity (in MW) | MW				31
Battery storage capacity (in MW) | MW				20
Equity Forward Sale Agreements | Pinnacle West
Long-Term Debt and Liquidity Matters
Sale of stock, settlement terms (in shares) | shares					11,240,601
Sale of stock, settlement proceeds from issuance of common stock					$ 728,000,000
Term Loan | APS
Long-Term Debt and Liquidity Matters
Debt instrument, term			364 days
Debt instrument, face amount			$ 350,000,000
Proceeds from short-term debt		$ 350,000,000
Term Loan | APS | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Long-Term Debt and Liquidity Matters
Variable rate			1.00%
Revolving Credit Facility | Revolving Credit Facility Maturing May 2026 | APS
Long-Term Debt and Liquidity Matters
Current borrowing capacity on credit facility								$ 500,000,000
Number of line of credit facilities | creditFacility								2
Revolving Credit Facility | Revolving Credit Facility Maturing April 2028 | APS
Long-Term Debt and Liquidity Matters
Current borrowing capacity on credit facility								$ 1,250,000,000
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)								1,650,000,000
Revolving Credit Facility | Revolving Credit Facility Maturing April 2028, Facility Two | APS
Long-Term Debt and Liquidity Matters
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)								400,000,000
Revolving Credit Facility | Revolving Credit Facility Maturing April 2028, Facility One | APS
Long-Term Debt and Liquidity Matters
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)								400,000,000
Revolving Credit Facility | Revolving Credit Facility Maturing in 2022 and 2023 | APS
Long-Term Debt and Liquidity Matters
Long-term line of credit					$ 0
Debt, weighted average interest rate					5.42%
Letter of Credit | APS
Long-Term Debt and Liquidity Matters
Outstanding letters of credit					$ 35,000,000
Letter of Credit | Revolving Credit Facility Maturing April 2028 | APS
Long-Term Debt and Liquidity Matters
Outstanding letters of credit					0
Commercial Paper | APS
Long-Term Debt and Liquidity Matters
Maximum commercial paper support available under credit facility								1,000,000,000	$ 750,000,000
Commercial Paper | Revolving Credit Facility Maturing April 2028 | APS
Long-Term Debt and Liquidity Matters
Commercial paper					384,000,000
Term Loan | Non-Recourse Construction Term Loan Facility | BCE
Long-Term Debt and Liquidity Matters
Debt instrument, face amount				$ 36,000,000
Bridge Loan | Equity Bridge Loan Facility | BCE
Long-Term Debt and Liquidity Matters
Debt instrument, face amount				$ 31,000,000			$ 31,000,000
Pinnacle West | Revolving Credit Facility | Revolving Credit Facility Maturing May 2026
Long-Term Debt and Liquidity Matters
Current borrowing capacity on credit facility									$ 200,000,000
Pinnacle West | Revolving Credit Facility | Revolving Credit Facility Maturing April 2028
Long-Term Debt and Liquidity Matters
Current borrowing capacity on credit facility								200,000,000
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)								$ 300,000,000
Long-term line of credit					0
Pinnacle West | Letter of Credit | Revolving Credit Facility Maturing April 2028
Long-Term Debt and Liquidity Matters
Outstanding letters of credit					0
Pinnacle West | Commercial Paper | Revolving Credit Facility Maturing April 2028
Long-Term Debt and Liquidity Matters
Commercial paper					$ 60,000,000
Debt, weighted average interest rate					5.47%