OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Variable Interest Entities [Line Items]
Cost Of Electric Fuel And Purchased Power From Utilities	$ 561	$ 498	$ 1,076	$ 979
Other operation and maintenance	727	713	1,428	1,371
Depreciation and amortization	314	307	642	610
Other income (expense), net	23	37	72	76
Interest expense	(142)	(139)	(285)	(273)
Net income	27	320	357	778
Earnings attributable to noncontrolling interest	(10)	(24)	(21)	(45)
Earnings attributable to common shares	16	295	335	732
Otay Mesa VIE [Member]
Variable Interest Entities [Line Items]
Cost Of Electric Fuel And Purchased Power From Utilities	(17)	(21)	(34)	(39)
Other operation and maintenance	15	6	19	10
Depreciation and amortization	10	6	17	12
Operating Expenses	8	(9)	2	(17)
Utility operating income	(8)	9	(2)	17
Interest expense	(5)	(5)	(10)	(9)
Net income	(13)	4	(12)	8
Earnings attributable to noncontrolling interest	13	(4)	12	(8)
Earnings attributable to common shares	0	$ 0	0	$ 0
Equity of variable interest entity	37		37		$ 53
Secured debt of variable interest entity	310		310
Cameron LNG Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 818		$ 818		$ 983