Document And Entity Information - shares |
9 Months Ended | |
|---|---|---|
Sep. 30, 2016 |
Oct. 11, 2016 |
|
| Document Type | 10-Q | |
| Amendment Flag | false | |
| Document Period End Date | Sep. 30, 2016 | |
| Document Fiscal Period Focus | Q3 | |
| Document Fiscal Year Focus | 2016 | |
| Trading Symbol | cms | |
| Entity Registrant Name | CMS Energy Corporation | |
| Entity Central Index Key | 0000811156 | |
| Current Fiscal Year End Date | --12-31 | |
| Entity Filer Category | Large Accelerated Filer | |
| CMS Energy [Member] | ||
| Entity Common Stock, Shares Outstanding | 279,907,911 | |
| Consumers Energy Company [Member] | ||
| Entity Registrant Name | Consumers Energy Company | |
| Entity Central Index Key | 0000201533 | |
| Entity Filer Category | Non-accelerated Filer | |
| Entity Common Stock, Shares Outstanding | 84,108,789 |