OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Variable Interest Entities Disclosure [Abstract]
Equity of variable interest entity	$ 77		$ 77		$ 91
Secured debt of variable interest entity	327		327
Amounts Associated With Variable Interest Entities, Operating Revenues, Electric	0	(4)	0	0
Amounts Associated With Variable Interest Entities, Operating Revenues, Gas	0	0	0	0
Amounts Associated With Variable Interest Entities, Total Operating Revenues	0	(4)	0	0
Amounts Associated With Variable Interest Entities, Cost of Electric Fuel And Purchased Power	(27)	(27)	(67)	(65)
Amounts Associated With Variable Interest Entities, Operation And Maintenance	3	7	13	33
Amounts Associated With Variable Interest Entities, Depreciation And Amortization	7	7	21	20
Amounts Associated With Variable Interest Entities, Total Operating Expenses	(17)	(13)	(33)	(12)
Amounts Associated With Variable Interest Entities, Operating Income (Loss)	17	9	33	12
Amounts Associated With Variable Interest Entities, Interest Expense	(5)	(4)	(13)	(11)
Amounts Associated With Variable Interest Entities, Net Income (Loss)	12	5	20	1
Amounts Associated With Variable Interest Entities, (Earnings) Losses Attributable Noncontrolling Interests	(12)	(5)	(20)	(1)
Amounts Associated With Variable Interest Entities, Earnings	$ 0	$ 0	$ 0	$ 0