Debt and Credit Agreements (Credit Agreements and Short-Term Debt) (Details) (USD $) In Millions, unless otherwise specified									12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Revolving credit facility maturing in July 2018	Dec. 31, 2013 Southern California Edison	Dec. 31, 2012 Southern California Edison	Dec. 31, 2013 Southern California Edison Revolving credit facility maturing in July 2018	Dec. 31, 2013 Commercial paper Southern California Edison Revolving credit facility maturing in July 2018	Dec. 31, 2012 Commercial paper Southern California Edison Revolving credit facility maturing in July 2018	Dec. 31, 2013 Letters of credit Southern California Edison Revolving credit facility maturing in July 2018
Short-term Debt [Line Items]
Commitment	$ 1,250		$ 1,250			$ 2,750
Outstanding borrowings	(34)		(34)			(175)
Outstanding letters of credit			0			(116)
Amount available			1,216			2,459
Letters of credit expiration period									12 months
Short-term debt	$ 209	$ 175		$ 175	$ 175			$ 175
Weighted average interest rate (as a percent)	0.55%						0.24%	0.37%