PRICE RISK MANAGEMENT ASSETS AND LIABILITIES Derivative Instruments Narrative (Details) (Interest Rate Swap, Ten Year Period [Member], USD $)	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2015
Interest Rate Swap, Ten Year Period [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Settlement of Interest Rate Swaps	$ 125,000,000	$ 150,000,000
Derivative, Notional Amount			$ 0