SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES STOCK-BASED COMPENSATION (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Stock Options
Information related to share based awards
Maximum term of awards	10 years
Percent vesting each year on the anniversary of the grant date (as a percent)	25.00%
Period of historical volatility used to estimate expected volatility	10 years
Performance Stock Rights
Information related to share based awards
Vesting period	3 years
Percentage value of award that can be deferred into deferred compensation plan	80.00%
Period prior to the end of the performance period during which employees cannot change their election to defer the value of award 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	$ 0
Performance Stock Rights \| Minimum
Information related to share based awards
Amount of performance payout (as a percent)	0.00%
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%
Period of historical volatility used to estimate expected volatility	3 years
Restricted Shares and Restricted Share Units
Information related to share based awards
Vesting period	4 years
Percent vesting each year on the anniversary of the grant date (as a percent)	25.00%
Percentage value of award that can be deferred into deferred compensation plan	80.00%
2010 Integrys Energy Group Omnibus Incentive Compensation Plan \| Stock Options
Information related to share based awards
Number of highest paid officers of entity or its subsidiary that cannot be granted awards in excess of a set amount	3
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	1,000,000
2010 Integrys Energy Group Omnibus Incentive Compensation Plan \| Performance Stock Rights
Information related to share based awards
Number of highest paid officers of entity or its subsidiary that cannot be granted awards in excess of a set amount	3
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	250,000

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

The period of time from the grant date until the time at which the share-based award expires.

+ References

No definition available.

+ Details

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- Definition

Maximum number of shares authorized for grant to single employee who is the entity's chief executive officer or other three highest compensated officers of entity or its subsidiaries under the equity-based compensation plan.

+ References

No definition available.

+ Details

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- Definition

Represents the number of years used in estimating the expected stock price volatility during the reporting period.

+ References

No definition available.

+ Details

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- Definition

Represents the number of highest paid officers of the entity or its subsidiary to whom can not receive a payout in excess of a set number of shares under the equity-based compensation plan.

+ References

No definition available.

+ Details

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- Definition

Payout percentage applied to the number of outstanding performance stock rights to determine the number of shares to be paid out under an equity-based compensation plan.

+ References

No definition available.

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- Definition

Represents the percentage value of an award that can be deferred into a deferred compensation plan under the equity-based compensation plan.

+ References

No definition available.

+ Details

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- Definition

Represents period prior to the end of the performance period during which employees cannot change their election to defer the value of award into deferred compensation plan.

+ References

No definition available.

+ Details

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- Definition

Represents the remaining performance period for which fair value on the modification date is used to measure the awards.

+ References

No definition available.

+ Details

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, shown as a percentage.

+ References

No definition available.

+ Details

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