OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Operating expenses
Cost Of Electric Fuel And Purchased Power From Utilities	$ 498	$ 571	$ 979	$ 1,081
Other operation and maintenance	713	729	1,371	1,405
Depreciation and amortization	307	288	610	574
Other income (expense), net	37	49	76	89
Interest expense	139	138	273	274
Net income	320	292	778	558
Earnings attributable to noncontrolling interest	(24)	(22)	(45)	(41)
Earnings attributable to common shares	295	269	732	516
Otay Mesa VIE [Member]
Operating expenses
Cost Of Electric Fuel And Purchased Power From Utilities	(21)	(22)	(39)	(40)
Other operation and maintenance	6	5	10	10
Depreciation and amortization	6	7	12	14
Operating Expenses	(9)	(10)	(17)	(16)
Utility operating income	9	10	17	16
Interest expense	(5)	(4)	(9)	(8)
Net income	4	6	8	8
Earnings attributable to noncontrolling interest	(4)	(6)	(8)	(8)
Earnings attributable to common shares	0	$ 0	0	$ 0
Equity of variable interest entity	61		61		$ 60
Secured debt of variable interest entity	320		320
Cameron LNG Holdings [Member]
Schedule Of Equity Method And Other Investments [Line Items]
Equity Method And Other Investments	$ 1,043		$ 1,043		$ 1,007