Regulatory Assets and Liabilities (Textual) (Details) - SCE		12 Months Ended
	Feb. 01, 2012	Dec. 31, 2016	Dec. 31, 2015
Regulatory Assets [Line Items]
Regulatory assets, energy derivatives, low range of contract expiration (in years)		10 years
Regulatory assets, energy derivatives, high range of contract expiration (in years)		45 years
Regulatory assets related to deferred income taxes, recovery period, low range (in years)		1 year
Regulatory assets related to deferred income taxes, recovery period, high range (in years)		60 years
Low end of the range of remaining original amortization (in years)		10 years
High end of the range of remaining original amortization (in years)		35 years
San Onofre
Regulatory Assets [Line Items]
Return rate earned on assets included in rate base (as a percent)		2.62%	2.62%
Period for rate recovery	10 years
Unamortized investments, net
Regulatory Assets [Line Items]
Return rate earned on assets included in rate base (as a percent)		7.90%	7.90%
Unamortized investments, net | Legacy Meters
Regulatory Assets [Line Items]
Return rate earned on assets included in rate base (as a percent)		6.46%	6.46%