Regulatory Assets and Liabilities (Textual) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets [Line Items]
Income tax benefit	$ (88)	$ 0	$ 466
SCE
Regulatory Assets [Line Items]
Regulatory assets, energy derivatives, low range of contract expiration (in years)	2 years
Regulatory assets, energy derivatives, high range of contract expiration (in years)	5 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)	40 years
Income tax benefit	$ (88)	$ 0	$ 33
Unamortized investments, net of accumulated amortization | SCE
Regulatory Assets [Line Items]
Return rate earned on assets included in rate base (as a percent)	7.61%	7.61%
Operating Leases Purchase Power Contracts | SCE
Regulatory Assets [Line Items]
Unpaid portion included in regulatory asset	$ 29	$ 206