Nuclear Decommissioning Trusts (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Nuclear decommissioning trust fund assets
Fair Value	$ 657,862,000		$ 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	103,157,000	135,240,000
Fair value of fixed income securities, summarized by contractual maturities
Total	657,862,000		642,007,000
ARIZONA PUBLIC SERVICE COMPANY
Nuclear decommissioning trust fund assets
Fair Value	657,862,000		642,007,000
Unrealized Gains	145,000,000		140,000,000
Unrealized Losses	(3,000,000)		(6,000,000)
Net payables for securities purchases	(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	2,000,000
Realized losses	(2,000,000)	(1,000,000)
Proceeds from the sale of securities	103,157,000	135,240,000
Fair value of fixed income securities, summarized by contractual maturities
Total	657,862,000		642,007,000
ARIZONA PUBLIC SERVICE COMPANY | Equity Securities
Nuclear decommissioning trust fund assets
Fair Value	277,000,000		272,000,000
Unrealized Gains	132,000,000		129,000,000
Fair value of fixed income securities, summarized by contractual maturities
Total	277,000,000		272,000,000
ARIZONA PUBLIC SERVICE COMPANY | Fixed income securities.
Nuclear decommissioning trust fund assets
Fair Value	386,000,000		373,000,000
Unrealized Gains	13,000,000		11,000,000
Unrealized Losses	(3,000,000)		(6,000,000)
Fair value of fixed income securities, summarized by contractual maturities
Less than one year	17,000,000
1 year - 5 years	109,000,000
5 years - 10 years	111,000,000
Greater than 10 years	149,000,000
Total	$ 386,000,000		$ 373,000,000