Summary of Significant Accounting Policies Asset Retirement Obligation (Details) (USD $)		6 Months Ended		12 Months Ended		3 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Southern California Edison		Dec. 31, 2013 Southern California Edison		Jun. 30, 2014 Southern California Edison San Onofre	Dec. 31, 2013 Southern California Edison San Onofre
Significant Accounting Policies [Line Items]
Decommissioning Costs, Future Value	$ 4,400,000,000	$ 3,300,000,000
Asset Retirement Obligation, Discount Rate	6.30%					6.30%
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance		3,418,000,000		2,782,000,000			2,700,000,000
Accretion1		106,000,000	[1]	182,000,000	[1]
Revisions		(604,000,000)		455,000,000		604,000,000
Liabilities settled		(1,000,000)		(1,000,000)
Ending balance		$ 2,919,000,000		$ 3,418,000,000		$ 2,200,000,000	$ 2,700,000,000

[1] An ARO represents the present value of a future obligation. Accretion is an increase in the liability to account for the time value of money resulting from discounting.