Other Investments (Textual) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Other Investments [Line Items]
Proceeds from sale of securities			$ 5,846,000,000	$ 4,574,000,000
Southern California Edison
Other Investments [Line Items]
Contributions received for decommissioning trusts			6,000,000
Proceeds from sale of securities	2,100,000,000	2,600,000,000	5,846,000,000	4,574,000,000
Unrealized holding gains, net of losses	1,800,000,000		1,800,000,000		1,700,000,000
Decommissioning Trust, Deferred Income Taxes	431,000,000		431,000,000
Nuclear decommissioning trusts	$ 4,300,000,000		$ 4,300,000,000