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

Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_RegulatoryAssetAmortizationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Additional Amount available through bill payment assistance program

No definition available.

Name:	wec_AdditionalAmountAvailableThroughBillPaymentAssistanceProgram
Namespace Prefix:	wec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Additional period of time deposit requirements will be waived for residential customers that verbally express financial hardship.

No definition available.

Name:	wec_AdditionalPeriodOfTimeDepositRequirementsWillBeWaived
Namespace Prefix:	wec_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Amount available for eligible customers through bill payment assistance programs due to COVID-19.

No definition available.

Name:	wec_AmountAvailableThroughBillPaymentAssistanceProgram
Namespace Prefix:	wec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of funds provided through bill payment assistance program

No definition available.

Name:	wec_AmountOfFundsProvidedThroughBillPaymentAssistanceProgram
Namespace Prefix:	wec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Number of orders issued in response to COVID-19.

No definition available.

Name:	wec_NumberOfOrdersIssuedInResponseToCOVID19
Namespace Prefix:	wec_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Percentage below federal poverty level for which customer disconnection is disallowed

No definition available.

Name:	wec_PercentageBelowFederalPovertyLevelForWhichCustomerDisconnectionIsDisallowed
Namespace Prefix:	wec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Period of time after the end of Minnesota's declared peacetime emergency during which the MPUC's COVID-19 order will remain in effect.

No definition available.

Name:	wec_PeriodOfTimeAfterPeacetimeEmergencyThatOrderWillBeEffective
Namespace Prefix:	wec_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_RegulatoryAgencyAxis=wec_PublicServiceCommissionofWisconsinMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

Name:	us-gaap_RegulatoryAssetAxis=wec_COVID19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

Name:	dei_LegalEntityAxis=wec_NSGMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: