Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 1,072	$ 1,128
Regulatory liabilities	6,017	5,676
Southern California Edison
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,072	1,128
Regulatory liabilities	6,017	5,676
Total regulatory liabilities	7,089	6,804
Southern California Edison | Regulatory balancing accounts
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,050	1,106
Regulatory liabilities	1,392	1,314
Southern California Edison | Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	22	22
Regulatory liabilities	60	79
Southern California Edison | Costs of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities	2,825	2,781
Southern California Edison | Recoveries in excess of ARO liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 1,740	$ 1,502