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SHORT-TERM CREDIT ARRANGEMENTS (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Disclosure of short-term credit arrangements [Abstract]  
Standby letter of credit outstanding $ 4.4
Standby Letter of Credit Expiring January 2014 [Member] | UIL [Member]
 
Disclosure of short-term credit arrangements [Abstract]  
Expiration date Jan. 31, 2014
Standby Letter of Credit Expiring June 2014 [Member] | UIL [Member]
 
Disclosure of short-term credit arrangements [Abstract]  
Expiration date Jun. 16, 2014
Revolving Credit Facility [Member] | UIL [Member]
 
Disclosure of short-term credit arrangements [Abstract]  
Amounts outstanding under the Credit Agreement 127
Expiration date Nov. 30, 2016
Available credit under the Credit Facility 268.6
Credit Agreement [Member] | UIL [Member]
 
Disclosure of short-term credit arrangements [Abstract]  
Amounts outstanding under the Credit Agreement $ 100
Expiration date Oct. 31, 2013