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Summary of Significant Accounting Policies - Leases (Details) | Dec. 31, 2021
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Accounting Policies [Abstract] |
Minimum lease term to recognize right of use asset and lease liabilities | 1 year

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- 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 Minimum lease term for which right of use asset and lease liabilities will be recognized + References No definition available. + Details
Name: | wec_MinimumLeaseTermToRecognizeRightOfUseAssetAndLeaseLiabilities
Namespace Prefix: | wec_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant