No definition available.

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

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostWeightedAverageInterestCreditingRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Year ultimate health care cost trend rate is expected to be reached, in YYYY format.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:gYearListItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	wec_WeightedaverageAssumptionsAxis=wec_BenefitobligationassumptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	wec_WeightedaverageAssumptionsAxis=wec_NetperiodicbenefitcostassumptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	wec_AgeCriteriaForMedicalBenefitsAxis=wec_Pre65Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	wec_AgeCriteriaForMedicalBenefitsAxis=wec_Post65Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Employee Benefits - Assumptions (Details)	12 Months Ended
Employee Benefits - Assumptions (Details)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan \| Benefit obligation assumptions
Weighted average assumptions - benefit obligations
Discount rate		5.49%	2.96%	2.67%
Rate of compensation increase		4.00%	4.00%
Interest credit rate		4.61%	3.73%
Pension Plan \| Net periodic benefit cost assumptions
Weighted average assumptions - net periodic benefit cost
Discount rate		3.18%	2.71%	3.34%
Expected return on plan assets		6.88%	6.88%	6.87%
Rate of compensation increase		4.00%	4.00%	4.00%
Interest credit rate		3.78%	3.71%	3.70%
Pension Plan \| Net periodic benefit cost assumptions \| Subsequent event
Weighted average assumptions - net periodic benefit cost
Expected return on plan assets	6.88%
OPEB Plan \| Benefit obligation assumptions
Weighted average assumptions - benefit obligations
Discount rate		5.50%	2.92%
OPEB Plan \| Benefit obligation assumptions \| Pre 65
Medical cost trend rates
Assumed medical cost trend rate		6.50%	5.70%
Ultimate trend rate		5.00%	5.00%
Year ultimate trend rate is reached		2031	2028
OPEB Plan \| Benefit obligation assumptions \| Post 65
Medical cost trend rates
Assumed medical cost trend rate		6.00%	5.67%
Ultimate trend rate		5.00%	5.00%
Year ultimate trend rate is reached		2031	2028
OPEB Plan \| Net periodic benefit cost assumptions
Weighted average assumptions - net periodic benefit cost
Discount rate		2.92%	2.66%	3.39%
Expected return on plan assets		7.00%	7.00%	7.00%
OPEB Plan \| Net periodic benefit cost assumptions \| Subsequent event
Weighted average assumptions - net periodic benefit cost
Expected return on plan assets	7.00%
OPEB Plan \| Net periodic benefit cost assumptions \| Pre 65
Medical cost trend rates
Assumed medical cost trend rate		5.70%	5.85%	6.00%
Ultimate trend rate		5.00%	5.00%	5.00%
Year ultimate trend rate is reached		2028	2028	2028
OPEB Plan \| Net periodic benefit cost assumptions \| Post 65
Medical cost trend rates
Assumed medical cost trend rate		5.67%	5.80%	5.91%
Ultimate trend rate		5.00%	5.00%	5.00%
Year ultimate trend rate is reached		2028	2028	2028