Investments (Textual) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Other Investments [Line Items]
Proceeds from sale of securities				$ 12,915	$ 5,846
Southern California Edison
Other Investments [Line Items]
Proceeds from sale of securities		$ 5,700	$ 2,100	12,915	$ 5,846
Unrealized holding gains, net of losses		1,400		1,400		$ 1,800
Deferred income taxes related to unrealized gains		344		344
Nuclear decommissioning trusts		$ 4,000		$ 4,000
Reimbursed expenses	$ 319