EMPLOYEE BENEFIT PLANS (Changes in Plan Assets and Benefit Obligations Recognized) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Amortization of Prior Service (Cost) Credit	$ (1,488,000)
Other Retiree Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Prior Service Cost (Credit)	(1,000,000)	0	(1,000,000)
Current Year Actuarial (Gain) Loss	(7,000,000)	(13,000,000)
Amortization of Actuarial (Gain) Loss	(1,000,000)	0	0
Other Retiree Benefits [Member] | Regulatory Asset [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Prior Service Cost (Credit)	0	0	(2,000,000)
Current Year Actuarial (Gain) Loss	(6,000,000)	2,000,000	0
Amortization of Actuarial (Gain) Loss	1,000,000	0	0
Amortization of Prior Service (Cost) Credit	1,000,000	0	1,000,000
Total Recognized (Gain) Loss	(6,000,000)	2,000,000	(1,000,000)
Amortization of estimated net loss in 2014	1,000,000
Pension Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Prior Service Cost (Credit)	0	0	0
Current Year Actuarial (Gain) Loss	(77,000,000)	(133,000,000)
Amortization of Actuarial (Gain) Loss	(9,000,000)	(7,000,000)	(6,000,000)
Pension Benefits [Member] | Regulatory Asset [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Current Year Actuarial (Gain) Loss	(46,000,000)	30,000,000	25,000,000
Amortization of Actuarial (Gain) Loss	8,000,000	7,000,000	5,000,000
Total Recognized (Gain) Loss	(54,000,000)	23,000,000	20,000,000
Estimated gain (loss) that will be amortized in the net periodic benefit cost in 2014	4,000,000
Amortization of estimated net loss in 2014	1,000,000
Pension Benefits [Member] | Accumulated Other Comprehensive Loss [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Current Year Actuarial (Gain) Loss	(1,000,000)	1,000,000	(2,000,000)
Amortization of Actuarial (Gain) Loss	0	0	0
Total Recognized (Gain) Loss	(1,000,000)	1,000,000	(2,000,000)
Amortization of estimated net loss in 2014	$ 1,000,000