Regulatory Matters (Details 2) (SCE, USD $) In Millions, unless otherwise specified	0 Months Ended
	Dec. 30, 2013 MW	Mar. 31, 2014
APS | Four Corners Units 4 and 5
Acquisition
Ownership interest acquired	48.00%	48.00%
Percentage of possible impact on average bill to residential customers	2.00%
Net receipt due to negotiation of alternate arrangement	$ 40
Capacity rights over the Arizona Transmission System assign to third-parties	1,555
Capacity rights related to marketing and trading group for transmission of the additional power received assign to third-parties	300
Four Corners
Acquisition
Deferral balance related to the acquisition of SCE's interest in Units 4 and 5 and the closure of Four Corners Units 1-3		$ 47