NEW ACCOUNTING PRONOUNCEMENTS (Details)	6 Months Ended
Jun. 30, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Deferral of effective date	1 year

Period of time for which the effective date will be delayed.

No definition available.

Name:	teg_Deferralofeffectivedate
Namespace Prefix:	teg_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration