OTHER FINANCIAL DATA - VARIABLE INTEREST ENTITIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Variable Interest Entities Disclosure [Abstract]
Equity of variable interest entity	$ 85		$ 85		$ 91
Secured debt of variable interest entity	330		330
Amounts Associated With Variable Interest Entities, Operating Revenues, Electric	0	5	0	4
Amounts Associated With Variable Interest Entities, Operating Revenues, Gas	0	0	0	0
Amounts Associated With Variable Interest Entities, Total Operating Revenues	0	5	0	4
Amounts Associated With Variable Interest Entities, Cost of Electric Fuel And Purchased Power	(22)	(21)	(40)	(38)
Amounts Associated With Variable Interest Entities, Operation And Maintenance	5	9	10	26
Amounts Associated With Variable Interest Entities, Depreciation And Amortization	7	6	14	13
Amounts Associated With Variable Interest Entities, Total Operating Expenses	(10)	(6)	(16)	1
Amounts Associated With Variable Interest Entities, Operating Income (Loss)	10	11	16	3
Amounts Associated With Variable Interest Entities, Other Income (Expense), Net	0	0	0	0
Amounts Associated With Variable Interest Entities, Interest Expense	(4)	(4)	(8)	(7)
Amounts Associated With Variable Interest Entities, Net Income (Loss)	6	7	8	(4)
Amounts Associated With Variable Interest Entities, (Earnings) Losses Attributable Noncontrolling Interests	(6)	(7)	(8)	4
Amounts Associated With Variable Interest Entities, Earnings	$ 0	$ 0	$ 0	$ 0