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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES STOCK-BASED COMPENSATION (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Stock Options  
Information related to share based awards  
Maximum term of awards 10 years
Percentage of stock options that becomes exercisable for retirees 25.00%teg_Percentagethatbecomesexercisable
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Period of historical volatility used to estimate expected volatility 10 years
Performance Stock Rights  
Information related to share based awards  
Vesting period 3 years
Maximum percentage value of award that can be deferred into deferred compensation plan 80.00%teg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageValueOfAwardThatCanBeDeferredIntoDeferredCompensationPlan
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Period prior to the end of the performance period during which employees cannot change their election to defer the value of awards into the deferred compensation plan 6 months
Remaining performance period for which fair value on the modification date is used to measure the awards 6 months
Incremental compensation expense due to an award modification 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Performance Stock Rights | Minimum  
Information related to share based awards  
Amount of performance payout (as a percent) 0.00%teg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPayoutRatio
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Period of historical volatility used to estimate expected volatility 1 year
Performance Stock Rights | Maximum  
Information related to share based awards  
Amount of performance payout (as a percent) 200.00%teg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPayoutRatio
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Period of historical volatility used to estimate expected volatility 3 years
Restricted Share Units  
Information related to share based awards  
Vesting period 4 years
Vesting rights percentage 25.00%teg_VestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Maximum percentage value of award that can be deferred into deferred compensation plan 80.00%teg_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageValueOfAwardThatCanBeDeferredIntoDeferredCompensationPlan
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Nonemployee Director Deferred Stock Units  
Information related to share based awards  
Vesting period 1 year
2014 Omnibus Incentive Compensation Plan  
Information related to share based awards  
Number of shares authorized for grant 3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= teg_OmnibusIncentiveCompensationPlan2014Member
Number of highest paid officers of entity or its subsidiary that cannot be granted awards in excess of a set amount 3teg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfHighestPaidOfficers
/ us-gaap_PlanNameAxis
= teg_OmnibusIncentiveCompensationPlan2014Member
2014 Omnibus Incentive Compensation Plan | Stock Options  
Information related to share based awards  
Number of shares authorized for grant to single employee who is entity's chief executive officer or other three highest compensated officers of entity or its subsidiaries 1,000,000teg_NumberofSharesAuthorizedforSingleEmployeeWhoIsEntitysChiefExecutiveOfficerChiefFinancialOfficerorThreeOtherHighestCompensatedOfficersofEntityoritsSubsidiaries
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= teg_OmnibusIncentiveCompensationPlan2014Member
2014 Omnibus Incentive Compensation Plan | Performance Stock Rights  
Information related to share based awards  
Number of shares authorized for grant to single employee who is entity's chief executive officer or other three highest compensated officers of entity or its subsidiaries 250,000teg_NumberofSharesAuthorizedforSingleEmployeeWhoIsEntitysChiefExecutiveOfficerChiefFinancialOfficerorThreeOtherHighestCompensatedOfficersofEntityoritsSubsidiaries
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= teg_OmnibusIncentiveCompensationPlan2014Member