Derivative Instruments (Balance Sheet Disclosures) (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	$ 79,000,000	$ 102,000,000
Long-Term, Derivative Assets	194,000,000	219,000,000
Short-Term, Derivative Liabilities	162,000,000	196,000,000
Long-Term, Derivative Liabilities	1,155,000,000	1,052,000,000
Southern California Edison
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	79,000,000	102,000,000
Long-Term, Derivative Assets	194,000,000	219,000,000
Short-Term, Derivative Liabilities	162,000,000	196,000,000
Long-Term, Derivative Liabilities	1,155,000,000	1,052,000,000
Southern California Edison | Electric Utility | Gross amounts recognized
Derivatives
Collateral already posted	0	13,000,000
Southern California Edison | Commodity Contracts | Electric Utility
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	79,000,000	102,000,000
Long-Term, Derivative Assets	194,000,000	219,000,000
Derivative Assets, Total	273,000,000	321,000,000
Short-Term, Derivative Liabilities	162,000,000	196,000,000
Long-Term, Derivative Liabilities	1,155,000,000	1,052,000,000
Derivative Liabilities, Total	1,317,000,000	1,248,000,000
Net Liability	1,044,000,000	927,000,000
Southern California Edison | Commodity Contracts | Electric Utility | Gross amounts recognized
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	92,000,000	104,000,000
Long-Term, Derivative Assets	194,000,000	219,000,000
Derivative Assets, Total	286,000,000	323,000,000
Short-Term, Derivative Liabilities	204,000,000	259,000,000
Long-Term, Derivative Liabilities	1,155,000,000	1,052,000,000
Derivative Liabilities, Total	1,359,000,000	1,311,000,000
Net Liability	1,073,000,000	988,000,000
Southern California Edison | Commodity Contracts | Electric Utility | Gross amounts offset in the consolidated balance sheets
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	(13,000,000)	(2,000,000)
Long-Term, Derivative Assets	0	0
Derivative Assets, Total	(13,000,000)	(2,000,000)
Short-Term, Derivative Liabilities	(13,000,000)	(2,000,000)
Long-Term, Derivative Liabilities	0	0
Derivative Liabilities, Total	(13,000,000)	(2,000,000)
Net Liability	0	0
Southern California Edison | Commodity Contracts | Electric Utility | Cash collateral posted
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	0	0
Long-Term, Derivative Assets	0	0
Derivative Assets, Total	0	0
Short-Term, Derivative Liabilities	(29,000,000)	(61,000,000)
Long-Term, Derivative Liabilities	0	0
Derivative Liabilities, Total	(29,000,000)	(61,000,000)
Net Liability	(29,000,000)	(61,000,000)
Other Current Assets | Southern California Edison | Commodity Contracts
Derivatives
Collateral already posted	$ 34,000,000	$ 36,000,000