SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES INCOME TAXES (Details) (Minimum)	12 Months Ended
Dec. 31, 2014
Minimum
Income taxes
Threshold ownership percentage used to determine subsidiary inclusion in consolidated income tax return	80.00%

Represents the ownership threshold used to determine whether subsidiaries are included in the entity's consolidated federal income tax return.

No definition available.

Name:	teg_IncomeTaxConsolidatedReturnInclusionThreshold
Namespace Prefix:	teg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration