Other Investments (Textual) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Other Investments [Line Items]
Proceeds from sale of securities			$ 3,750,000,000	$ 1,956,000,000
Southern California Edison
Other Investments [Line Items]
Contributions received for decommissioning trusts			6,000,000
Proceeds from sale of securities	2,200,000,000	1,500,000,000	3,750,000,000	1,956,000,000
Unrealized holding gains, net of losses	$ 1,900,000,000		$ 1,900,000,000		$ 1,700,000,000