OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Variable Interest Entities [Line Items]
Cost Of Electric Fuel And Purchased Power From Utilities	$ 515	$ 481
Other operation and maintenance	701	658
Depreciation and amortization	328	303
Other income (expense), net	49	39
Interest expense	(143)	(134)
Net income	330	458
Earnings attributable to noncontrolling interest	(11)	(21)
Earnings attributable to common shares	319	437
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	2,727		$ 2,905
Otay Mesa VIE [Member]
Variable Interest Entities [Line Items]
Cost Of Electric Fuel And Purchased Power From Utilities	(17)	(18)
Other operation and maintenance	4	4
Depreciation and amortization	7	6
Operating Expenses	(6)	(8)
Utility operating income	6	8
Interest expense	(5)	(4)
Net income	1	4
Earnings attributable to noncontrolling interest	(1)	(4)
Earnings attributable to common shares	0	$ 0
Equity of variable interest entity	51		53
Secured debt of variable interest entity	312
Cameron LNG Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 872		$ 983