EMPLOYEE BENEFIT PLANS (Components of Regulatory Assets and Accumulated Other Comprehensive Loss Not Recognized as Net Periodic Benefit Cost) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits [Member]
Pension And Other Employee Benefit Plans [Line Items]
Net Loss	$ 77	$ 133
Prior Service Cost (Benefit)	0	1
Other Retiree Benefits [Member]
Pension And Other Employee Benefit Plans [Line Items]
Net Loss	7	13
Prior Service Cost (Benefit)	$ (3)	$ (3)