Cover
Oct. 01, 2019
Entity Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 01, 2019
Entity File Number 1-9513
Entity Registrant Name CMS ENERGY CORPORATION
Entity Central Index Key 0000811156
Entity Tax Identification Number 38-2726431
Entity Incorporation, State or Country Code MI
Entity Address, Address Line One One Energy Plaza
Entity Address, City or Town Jackson
Entity Address, State or Province MI
Entity Address, Postal Zip Code 49201
City Area Code 517
Local Phone Number 788-0550
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Entity Information [Line Items]  
Title of 12(b) Security CMS Energy Corporation Common Stock, $0.01 par value
Trading Symbol CMS
Security Exchange Name NYSE
A 5.625 Junior Subordinated Notes Due 2078 Member  
Entity Information [Line Items]  
Title of 12(b) Security CMS Energy Corporation 5.625% Junior Subordinated Notes due 2078
Trading Symbol CMSA
Security Exchange Name NYSE
A 5.875 Junior Subordinated Notes Due 2078 Member  
Entity Information [Line Items]  
Title of 12(b) Security CMS Energy Corporation 5.875% Junior Subordinated Notes due 2078
Trading Symbol CMSC
Security Exchange Name NYSE
A 5.875 Junior Subordinated Notes Due 2079 Member  
Entity Information [Line Items]  
Title of 12(b) Security CMS Energy Corporation 5.875% Junior Subordinated Notes due 2079
Trading Symbol CMSD
Security Exchange Name NYSE
Consumers Energy Company Member  
Entity Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 01, 2019
Entity File Number 1-5611
Entity Registrant Name CONSUMERS ENERGY COMPANY
Entity Central Index Key 0000201533
Entity Tax Identification Number 38-0442310
Entity Incorporation, State or Country Code MI
Entity Address, Address Line One One Energy Plaza
Entity Address, City or Town Jackson
Entity Address, State or Province MI
Entity Address, Postal Zip Code 49201
City Area Code 517
Local Phone Number 788-0550
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Consumers Energy Company Cumulative Preferred Stock, $1.00 par value:$4.50 Series
Trading Symbol CMS-PB
Security Exchange Name NYSE
Entity Emerging Growth Company false