OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Variable Interest Entities [Line Items]
Cost Of Electric Fuel And Purchased Power From Utilities	$ 481	$ 510
Other operation and maintenance	658	676
Depreciation and amortization	303	286
Other income (expense), net	39	40
Interest expense	134	136
Net income	458	266
Earnings attributable to noncontrolling interest	(21)	(19)
Earnings attributable to common shares	437	247
Cameron LNG Holdings [Member]
Schedule Of Equity Method And Other Investments [Line Items]
Equity Method And Other Investments	969		1,007
Otay Mesa VIE [Member]
Variable Interest Entities [Line Items]
Cost Of Electric Fuel And Purchased Power From Utilities	(18)	(18)
Other operation and maintenance	4	5
Depreciation and amortization	6	7
Operating Expenses	(8)	(6)
Utility operating income	8	6
Interest expense	(4)	(4)
Net income	4	2
Earnings attributable to noncontrolling interest	(4)	(2)
Earnings attributable to common shares	0	0
Equity of variable interest entity	59		60
Secured debt of variable interest entity	$ 322