Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Income Taxes
Income tax refunds	$ 135
Increase (decrease) in deferred income taxes due to adoption of regulations	29
Palo Verde VIE
Income Taxes
Income tax expense associates with the VIE's	0
ARIZONA PUBLIC SERVICE COMPANY
Income Taxes
Increase (decrease) in deferred income taxes due to adoption of regulations	$ 16