Nuclear Decommissioning Trusts (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Nuclear decommissioning trust fund assets
Fair Value	$ 682,359,000		$ 682,359,000		$ 642,007,000
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Proceeds from the sale of securities			199,224,000	253,996,000
Fair value of fixed income securities, summarized by contractual maturities
Total	682,359,000		682,359,000		642,007,000
ARIZONA PUBLIC SERVICE COMPANY
Nuclear decommissioning trust fund assets
Fair Value	682,359,000		682,359,000		642,007,000
Unrealized Gains	161,000,000		161,000,000		140,000,000
Unrealized Losses	(1,000,000)		(1,000,000)		(6,000,000)
Net payables for securities purchases	(5,000,000)		(5,000,000)		(3,000,000)
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	1,000,000	1,000,000	2,000,000	3,000,000
Realized losses	(1,000,000)	(1,000,000)	(3,000,000)	(2,000,000)
Proceeds from the sale of securities	96,000,000	119,000,000	199,224,000	253,996,000
Fair value of fixed income securities, summarized by contractual maturities
Total	682,359,000		682,359,000		642,007,000
ARIZONA PUBLIC SERVICE COMPANY | Equity Securities
Nuclear decommissioning trust fund assets
Fair Value	291,000,000		291,000,000		272,000,000
Unrealized Gains	145,000,000		145,000,000		129,000,000
Fair value of fixed income securities, summarized by contractual maturities
Total	291,000,000		291,000,000		272,000,000
ARIZONA PUBLIC SERVICE COMPANY | Fixed income securities.
Nuclear decommissioning trust fund assets
Fair Value	396,000,000		396,000,000		373,000,000
Unrealized Gains	16,000,000		16,000,000		11,000,000
Unrealized Losses	(1,000,000)		(1,000,000)		(6,000,000)
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	22,000,000		22,000,000
1 year - 5 years	118,000,000		118,000,000
5 years - 10 years	109,000,000		109,000,000
Greater than 10 years	147,000,000		147,000,000
Total	$ 396,000,000		$ 396,000,000		$ 373,000,000