v3.4.0.3
Document and Enttity Information
3 Months Ended
Mar. 31, 2016
shares
Document and Entity Information [Abstract]  
Entity Registrant Name WEC Energy Group, Inc.
Entity Central Index Key 0000783325
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Document Type 10-Q
Document Period End Date Mar. 31, 2016
Document Fiscal Year Focus 2016
Document Fiscal Period Focus Q1
Amendment Flag false
Entity Common Stock, Shares Outstanding 315,647,207