COMMITMENTS AND CONTINGENCIES (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended
	May 31, 2007 mi entity	Mar. 31, 2015	Mar. 31, 2014
Commitments And Contingencies Disclosure [Line Items]
Period of letters of credit		1 year
Number of other companies to perform a Remedial Investigation/ Feasibility Study related to the Lower Passaic River Clean-Up lawsuit	70
Number of miles of the River used in the Remedial Investigation/Feasibility Study	17
Proposed Settlement		$ 48,100,000
Cooperating Parties Group [Member]
Commitments And Contingencies Disclosure [Line Items]
Estimated operation and maintenance costs		93,000,000
Estimated operation and maintenance costs, Period		30 years
Minimum [Member] | EPA [Member]
Commitments And Contingencies Disclosure [Line Items]
Estimated implementation costs		950,000,000
Minimum [Member] | Cooperating Parties Group [Member]
Commitments And Contingencies Disclosure [Line Items]
Estimated implementation costs		475,000,000
Maximum [Member] | EPA [Member]
Commitments And Contingencies Disclosure [Line Items]
Estimated implementation costs		1,730,000,000
Maximum [Member] | Cooperating Parties Group [Member]
Commitments And Contingencies Disclosure [Line Items]
Estimated implementation costs		725,000,000
Bank line of Credit [Member]
Commitments And Contingencies Disclosure [Line Items]
Line of credit		$ 500,000,000	$ 500,000,000