Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Regulatory Assets
Regulatory Assets, Current	$ 1,066	$ 1,066	$ 1,254
Regulatory Asset, Long-term	8,009	8,009	7,612
Regulatory Liabilities
Regulatory Liabilities, Current	454	454	401
Regulatory Liabilities, Long-term	5,813	5,813	5,889
Southern California Edison
Regulatory Assets
Regulatory Assets, Current	1,066	1,066	1,254
Regulatory Asset, Long-term	8,009	8,009	7,612
Total Regulatory Assets	9,075	9,075	8,866
Regulatory Liabilities
Regulatory Liabilities, Current	454	454	401
Regulatory Liabilities, Long-term	5,813	5,813	5,889
Total Regulatory Liabilities	6,267	6,267	6,290
Southern California Edison | Regulatory balancing accounts
Regulatory Assets
Regulatory Assets, Current	911	911	1,088
Regulatory Asset, Long-term	54	54	44
Southern California Edison | Energy derivatives
Regulatory Assets
Regulatory Assets, Current	116	116	159
Regulatory Asset, Long-term	975	975	850
Southern California Edison | San Onofre
Regulatory Assets
Regulatory Asset, Long-term	1,203	1,203	1,288
Southern California Edison | Deferred income taxes, net
Regulatory Assets
Regulatory Asset, Long-term	3,777	3,777	3,405
Southern California Edison | Pensions and other postretirement benefits
Regulatory Assets
Regulatory Asset, Long-term	1,210	1,210	1,218
Southern California Edison | Unamortized investments, net
Regulatory Assets
Regulatory Asset, Long-term	217	217	255
Southern California Edison | Unamortized loss on reacquired debt
Regulatory Assets
Regulatory Asset, Long-term	210	210	201
Southern California Edison | Regulatory balancing accounts
Regulatory Liabilities
Regulatory Liabilities, Current	354	354	380
Regulatory Liabilities, Long-term	1,080	1,080	1,083
Southern California Edison | Other
Regulatory Assets
Regulatory Assets, Current	39	39	7
Regulatory Asset, Long-term	363	363	351
Regulatory Liabilities
Regulatory Liabilities, Current	100	100	21
Regulatory Liabilities, Long-term	58	58	24
Southern California Edison | Costs of removal
Regulatory Liabilities
Regulatory Liabilities, Long-term	2,767	2,767	2,826
Southern California Edison | Recoveries in excess of ARO liabilities
Regulatory Liabilities
Regulatory Liabilities, Long-term	1,908	1,908	$ 1,956
California Public Utilities Commission | Scenario, Forecast
Regulatory Liabilities
Deferral of revenue requirement	$ 49	$ 85