New Accounting Standards (Details) - USD ($) $ in Thousands			12 Months Ended
	Jul. 03, 2018	Jul. 06, 2016	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of income tax effects related to new tax reform (See Note 2)			$ (8,552)
Right-of-use lease assets			194,000
Lease, cost			119,000
Other			129,312	$ 130,666
Other current liabilities			184,229	246,529
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net benefit costs capitalized			(15,000)
Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of income tax effects related to new tax reform (See Note 2)			9,000
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other			(85,000)
Other current liabilities			(10,000)
ARIZONA PUBLIC SERVICE COMPANY
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of income tax effects related to new tax reform (See Note 2)			(5,038)
Other			128,265	129,801
Other current liabilities			178,137	$ 243,922
ARIZONA PUBLIC SERVICE COMPANY | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of income tax effects related to new tax reform (See Note 2)			$ 5,000
Four Corners | 4CA
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage share cost of control	7.00%	7.00%