Regulatory Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Regulatory Assets
Regulatory Assets, Current	$ 538	$ 572
Regulatory Asset, Long-term	7,241	6,422
Regulatory Liabilities
Regulatory Liabilities, Current	767	536
Regulatory Liabilities, Long-term	4,995	5,214
Southern California Edison
Regulatory Assets and Liabilities
Regulatory assets, energy derivatives, low range of contract expiration (in years)	1 year
Regulatory assets, energy derivatives, high range of contract expiration (in years)	10 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)	45 years
Low end of the range of remaining original amortization (in years)	1 year
High end of the range of remaining original amortization (in years)	30 years
Regulatory Assets
Regulatory Assets, Current	538	572
Regulatory Asset, Long-term	7,241	6,422
Total Regulatory Assets	7,779	6,994
Regulatory Liabilities
Regulatory Liabilities, Current	767	536
Regulatory Liabilities, Long-term	4,995	5,214
Total Regulatory Liabilities	5,762	5,750
Southern California Edison | Regulatory balancing accounts
Regulatory Assets
Regulatory Assets, Current	484	502
Regulatory Asset, Long-term	818	73
Southern California Edison | Energy derivatives
Regulatory Assets
Regulatory Assets, Current	54	70
Regulatory Asset, Long-term	816	900
Southern California Edison | Other
Regulatory Assets
Regulatory Asset, Long-term	368	360
Regulatory Liabilities
Regulatory Liabilities, Current	43	52
Regulatory Liabilities, Long-term	12	7
Southern California Edison | Deferred income taxes, net
Regulatory Assets
Regulatory Asset, Long-term	2,957	2,663
Southern California Edison | Pensions and other postretirement benefits
Regulatory Assets
Regulatory Asset, Long-term	369	1,550
Southern California Edison | Unamortized investments, net
Regulatory Assets and Liabilities
Return rate earned on assets included in rate base (as a percent)	7.90%	8.74%
Regulatory Assets
Regulatory Asset, Long-term	332	507
Southern California Edison | San Onofre [Member]
Regulatory Assets
Regulatory Asset, Long-term	1,325	0
Southern California Edison | Unamortized loss on reacquired debt
Regulatory Assets
Regulatory Asset, Long-term	222	228
Southern California Edison | Nuclear-related investment, net
Regulatory Assets
Regulatory Asset, Long-term	34	141
Southern California Edison | Regulatory Balancing Accounts, Liabilities
Regulatory Liabilities
Regulatory Liabilities, Current	724	484
Regulatory Liabilities, Long-term	1,132	1,091
Southern California Edison | Costs of Removal
Regulatory Liabilities
Regulatory Liabilities, Long-term	2,780	2,731
Southern California Edison | Asset Retirement Obligations
Regulatory Liabilities
Regulatory Liabilities, Long-term	$ 1,071	$ 1,385
Legacy Meters | Southern California Edison | Unamortized investments, net
Regulatory Assets and Liabilities
Return rate earned on assets included in rate base (as a percent)	6.46%