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GENERAL INFORMATION - GENERAL (Details) customer in Millions | Sep. 30, 2019 customer
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Electric |
Product information [Line Items] |
Number Of Customers | 1.6
Natural gas |
Product information [Line Items] |
Number Of Customers | 2.9

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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
Name: | us-gaap_ProductInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of customers served by the entity. + References No definition available. + Details
Name: | wec_NumberOfCustomers
Namespace Prefix: | wec_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ElectricityUsRegulatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_NaturalGasUsRegulatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |