OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Operating expenses
Cost Of Electric Fuel And Purchased Power From Utilities	$ 666	$ 680	$ 1,645	$ 1,761
Other operation and maintenance	701	726	2,072	2,131
Depreciation and amortization	315	292	925	866
Other income (expense), net	12	29	88	118
Interest expense	143	144	416	418
Net income	282	383	1,060	941
Earnings attributable to noncontrolling interest	(34)	(35)	(79)	(76)
Earnings attributable to common shares	248	348	980	864
Otay Mesa VIE [Member]
Operating expenses
Cost Of Electric Fuel And Purchased Power From Utilities	(27)	(27)	(66)	(67)
Other operation and maintenance	3	3	13	13
Depreciation and amortization	7	7	19	21
Operating Expenses	(17)	(17)	(34)	(33)
Utility operating income	17	17	34	33
Interest expense	(5)	(5)	(14)	(13)
Net income	12	12	20	20
Earnings attributable to noncontrolling interest	(12)	(12)	(20)	(20)
Earnings attributable to common shares	0	$ 0	0	$ 0
Equity of variable interest entity	64		64		$ 60
Secured debt of variable interest entity	317		317
Cameron LNG Holdings [Member]
Schedule Of Equity Method And Other Investments [Line Items]
Equity Method And Other Investments	$ 956		$ 956		$ 1,007