Other Investments (Textual) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Investments [Line Items]
Proceeds from sale of securities	$ 5,617,000,000	$ 2,122,000,000	$ 2,773,000,000
Southern California Edison
Other Investments [Line Items]
Contributions received for decommissioning trusts	23,000,000
Period of reviewing contributions from decommissioning trusts (in years)	3 years
Proceeds from sale of securities	5,617,000,000	2,122,000,000	2,773,000,000
Unrealized holding gains, net of losses	$ 1,700,000,000	$ 1,600,000,000