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

Minimum lease term for which right of use asset and lease liabilities will be recognized

No definition available.

Name:	wec_MinimumLeaseTermToRecognizeRightOfUseAssetAndLeaseLiabilities
Namespace Prefix:	wec_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant