Long-Term Debt and Liquidity Matters (Details) (USD $)	6 Months Ended					6 Months Ended			6 Months Ended																	0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Pinnacle West	Dec. 31, 2013 Pinnacle West	Jun. 30, 2014 APS	Jun. 30, 2013 APS	Dec. 31, 2013 APS	Jun. 30, 2014 APS SCE Four Corners Units 4 and 5 item	Dec. 30, 2013 APS SCE Four Corners Units 4 and 5	Jun. 30, 2014 APS ACC	Jun. 30, 2014 APS ACC Minimum	Jun. 30, 2014 Long term debt APS item	Jul. 12, 2013 Pollution Control Revenue Refunding Bonds, 1994 Series A APS	Oct. 11, 2013 Pollution Control Revenue Refunding Bonds, 1994 Series C APS	May 09, 2014 Revolving credit facility maturing in 2016 APS	Jun. 30, 2014 Revolving credit facility maturing in 2018 APS	Jun. 30, 2014 New revolving credit facility maturing in 2019 Pinnacle West	May 09, 2014 New revolving credit facility maturing in 2019 Pinnacle West	May 09, 2014 New revolving credit facility maturing in 2019 APS	Jan. 10, 2014 4.70% unsecured senior notes that mature on January 15, 2044 APS	May 01, 2014 Pollution Control Revenue Refunding Bonds, 2009 Series A, D and E APS	Jun. 01, 2014 Pollution Control Revenue Refunding Bonds, 2009 Series A APS	May 30, 2014 Pollution Control Revenue Refunding Bonds, 2009 Series A APS	Jun. 18, 2014 3.35% unsecured senior note APS	Jun. 18, 2014 5.80% senior notes APS	May 14, 2014 2009 series A bonds APS	May 01, 2014 2009 series D and series E bonds APS	Jun. 01, 2014 2009 series B and series C bonds APS
Long-Term Debt and Liquidity Matters
Current borrowing capacity on credit facility													$ 1,000,000,000			$ 500,000,000	$ 500,000,000		$ 200,000,000	$ 500,000,000
Maximum commercial paper support available under credit facility													250,000,000					200,000,000
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders																	700,000,000	300,000,000
Outstanding borrowings													0					0
Outstanding letters of credit													0					0
Commercial paper borrowings outstanding													173,000,000					4,000,000
Long-term debt redemption														33,000,000	32,000,000							100,000,000		38,000,000				64,000,000	64,000,000
Repurchase debt amount																							13,000,000				36,000,000
Notes issued																					250,000,000				250,000,000
Interest rate (as a percent)																					4.70%				3.35%	5.80%
Repayment of long-term debt	503,583,000	40,127,000				503,583,000	40,127,000																			300,000,000
Ownership interest acquired									48.00%	48.00%
Number of tax-exempt indebtedness series re-acquired									2
Estimated fair value of long-term debt, including current maturities
Carrying Amount	3,368,000,000		3,337,000,000	125,000,000	125,000,000	3,243,000,000		3,212,000,000
Fair Value	3,753,000,000		3,579,000,000	125,000,000	125,000,000	3,628,000,000		3,454,000,000
Debt Provisions
Required common equity ratio ordered by ACC (as a percent)												40.00%
Total shareholder equity	4,233,890,000		4,194,470,000			4,342,093,000		4,308,884,000			4,300,000,000
Total capitalization											7,500,000,000
Dividend restrictions, shareholder equity required											$ 3,000,000,000
Number of line of credit facilities													2