Derivative Instruments (Balance Sheet Disclosures) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	$ 112		$ 122
Long-Term, Derivative Assets	240		251
Short-Term, Derivative Liabilities	143		152
Long-Term, Derivative Liabilities	985		1,042
Southern California Edison
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	112		122
Long-Term, Derivative Assets	240		251
Short-Term, Derivative Liabilities	143		152
Long-Term, Derivative Liabilities	985		1,042
Southern California Edison | Commodity Contracts | Electric Utility
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	112		122
Long-Term, Derivative Assets	240		251
Derivative Assets, Total	352		373
Short-Term, Derivative Liabilities	143		152
Long-Term, Derivative Liabilities	985		1,042
Derivative Liabilities, Total	1,128		1,194
Net Liability	776		821
Southern California Edison | Commodity Contracts | Electric Utility | Economic hedges
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	135		141
Long-Term, Derivative Assets	240		251
Derivative Assets, Total	375		392
Short-Term, Derivative Liabilities	170		178
Long-Term, Derivative Liabilities	987		1,045
Derivative Liabilities, Total	1,157		1,223
Net Liability	782		831
Southern California Edison | Commodity Contracts | Electric Utility | Netting and Collateral
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	(23)		(19)
Long-Term, Derivative Assets	0		0
Derivative Assets, Total	(23)		(19)
Short-Term, Derivative Liabilities	(23)		(19)
Long-Term, Derivative Liabilities	0		0
Derivative Liabilities, Total	(23)		(19)
Net Liability	0		0
Southern California Edison | Commodity Contracts | Electric Utility | Cash Collateral Posted
Fair Value of Derivative Instruments
Short-Term, Derivative Assets	0	[1]	0	[1]
Long-Term, Derivative Assets	0	[1]	0	[1]
Derivative Assets, Total	0	[1]	0	[1]
Short-Term, Derivative Liabilities	(4)	[1]	(7)	[1]
Long-Term, Derivative Liabilities	(2)	[1]	(3)	[1]
Derivative Liabilities, Total	(6)	[1]	(10)	[1]
Net Liability	$ (6)	[1]	$ (10)	[1]

[1] In addition, at March 31, 2014 and December 31, 2013, SCE had posted $7 million and $19 million, respectively, of collateral that is not offset against derivative liabilities and is reflected in "Other current assets" on the consolidated balance sheets.