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REGULATORY ENVIRONMENT - PGL (Details) | Mar. 31, 2020 Assurance
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Illinois Commerce Commission (ICC) | PGL |
Public Utilities, General Disclosures [Line Items] |
Amount of assurance that PGL's QIP rider costs will be recoverable | 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of assurance that the costs incurred under PGL's Qualifying Infrastructure Plant rider will be recoverable. + References No definition available. + Details
Name: | wec_AmountOfAssuranceQIPRiderCostsRecoverable
Namespace Prefix: | wec_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RegulatoryAgencyAxis=wec_IllinoisCommerceCommissionICCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=wec_ThePeoplesGasLightAndCokeCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |