Nuclear Decommissioning Trusts (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Nuclear decommissioning trust fund assets
Fair Value	$ 642,007,000	$ 570,625,000
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Proceeds from the sale of securities	446,025,000	417,603,000	497,780,000
Fair value of fixed income securities, summarized by contractual maturities
Total	642,007,000	570,625,000
ARIZONA PUBLIC SERVICE COMPANY
Nuclear decommissioning trust fund assets
Fair Value	642,007,000	570,625,000
Unrealized Gains	140,000,000	91,000,000
Unrealized Losses	(6,000,000)
Net payables for securities purchases	(3,000,000)	(4,000,000)
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
Realized gains	6,000,000	7,000,000	8,000,000
Realized losses	(7,000,000)	(4,000,000)	(5,000,000)
Proceeds from the sale of securities	446,025,000	417,603,000	497,780,000
Fair value of fixed income securities, summarized by contractual maturities
Total	642,007,000	570,625,000
ARIZONA PUBLIC SERVICE COMPANY | Equity Securities
Nuclear decommissioning trust fund assets
Fair Value	272,000,000	204,000,000
Unrealized Gains	129,000,000	67,000,000
Fair value of fixed income securities, summarized by contractual maturities
Total	272,000,000	204,000,000
ARIZONA PUBLIC SERVICE COMPANY | Fixed income securities.
Nuclear decommissioning trust fund assets
Fair Value	373,000,000	371,000,000
Unrealized Gains	11,000,000	24,000,000
Unrealized Losses	(6,000,000)
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	9,000,000
1 year - 5 years	109,000,000
5 years - 10 years	108,000,000
Greater than 10 years	147,000,000
Total	$ 373,000,000	$ 371,000,000