XML 173 R31.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Quarterly Financial And Common Stock Information (Unaudited) | 12 Months Ended
--- | ---
Dec. 31, 2019
Quarterly Financial and Common Stock Information [Line Items] |
Quarterly Financial and Common Stock Information (Unaudited) | Quarterly Financial and Common Stock Information (Unaudited)
In Millions, Except Per Share Amounts |
| 2019
Quarters Ended | March 31 |  | June 30 |  | Sept 30 |  | Dec 31 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 2,059 |  |  | $ | 1,445 |  |  | $ | 1,546 |  |  | $ | 1,795 |
Operating income |  | 359 |  |  | 218 |  |  | 351 |  |  | 311 |
Net income |  | 213 |  |  | 94 |  |  | 207 |  |  | 168 |
Income attributable to noncontrolling interests |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income available to common stockholders |  | 213 |  |  | 93 |  |  | 207 |  |  | 167 |
Basic earnings per average common share¹ |  | 0.75 |  |  | 0.33 |  |  | 0.73 |  |  | 0.59 |
Diluted earnings per average common share¹ |  | 0.75 |  |  | 0.33 |  |  | 0.73 |  |  | 0.58 |
Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 1,943 |  |  | $ | 1,334 |  |  | $ | 1,429 |  |  | $ | 1,670 |
Operating income |  | 328 |  |  | 175 |  |  | 319 |  |  | 308 |
Net income |  | 226 |  |  | 98 |  |  | 213 |  |  | 206 |
Preferred stock dividends |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income available to common stockholder |  | 226 |  |  | 97 |  |  | 213 |  |  | 205 |
1 | The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.
In Millions, Except Per Share Amounts |
| 2018
Quarters Ended | March 31 |  | June 30 |  | Sept 30 |  | Dec 31 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 1,953 |  |  | $ | 1,492 |  |  | $ | 1,599 |  |  | $ | 1,829 |
Operating income |  | 363 |  |  | 255 |  |  | 294 |  |  | 250 |
Net income |  | 241 |  |  | 140 |  |  | 169 |  |  | 109 |
Income attributable to noncontrolling interests |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income available to common stockholders |  | 241 |  |  | 139 |  |  | 169 |  |  | 108 |
Basic earnings per average common share¹ |  | 0.86 |  |  | 0.49 |  |  | 0.60 |  |  | 0.38 |
Diluted earnings per average common share¹ |  | 0.86 |  |  | 0.49 |  |  | 0.59 |  |  | 0.38 |
Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 1,855 |  |  | $ | 1,395 |  |  | $ | 1,502 |  |  | $ | 1,712 |
Operating income |  | 334 |  |  | 229 |  |  | 271 |  |  | 231 |
Net income |  | 242 |  |  | 152 |  |  | 180 |  |  | 131 |
Preferred stock dividends |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income available to common stockholder |  | 242 |  |  | 151 |  |  | 180 |  |  | 130 |
1 | The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.
(This page intentionally left blank)
Consumers Energy Company |
Quarterly Financial and Common Stock Information [Line Items] |
Quarterly Financial and Common Stock Information (Unaudited) | Quarterly Financial and Common Stock Information (Unaudited)
In Millions, Except Per Share Amounts |
| 2019
Quarters Ended | March 31 |  | June 30 |  | Sept 30 |  | Dec 31 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 2,059 |  |  | $ | 1,445 |  |  | $ | 1,546 |  |  | $ | 1,795 |
Operating income |  | 359 |  |  | 218 |  |  | 351 |  |  | 311 |
Net income |  | 213 |  |  | 94 |  |  | 207 |  |  | 168 |
Income attributable to noncontrolling interests |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income available to common stockholders |  | 213 |  |  | 93 |  |  | 207 |  |  | 167 |
Basic earnings per average common share¹ |  | 0.75 |  |  | 0.33 |  |  | 0.73 |  |  | 0.59 |
Diluted earnings per average common share¹ |  | 0.75 |  |  | 0.33 |  |  | 0.73 |  |  | 0.58 |
Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 1,943 |  |  | $ | 1,334 |  |  | $ | 1,429 |  |  | $ | 1,670 |
Operating income |  | 328 |  |  | 175 |  |  | 319 |  |  | 308 |
Net income |  | 226 |  |  | 98 |  |  | 213 |  |  | 206 |
Preferred stock dividends |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income available to common stockholder |  | 226 |  |  | 97 |  |  | 213 |  |  | 205 |
1 | The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.
In Millions, Except Per Share Amounts |
| 2018
Quarters Ended | March 31 |  | June 30 |  | Sept 30 |  | Dec 31 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 1,953 |  |  | $ | 1,492 |  |  | $ | 1,599 |  |  | $ | 1,829 |
Operating income |  | 363 |  |  | 255 |  |  | 294 |  |  | 250 |
Net income |  | 241 |  |  | 140 |  |  | 169 |  |  | 109 |
Income attributable to noncontrolling interests |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income available to common stockholders |  | 241 |  |  | 139 |  |  | 169 |  |  | 108 |
Basic earnings per average common share¹ |  | 0.86 |  |  | 0.49 |  |  | 0.60 |  |  | 0.38 |
Diluted earnings per average common share¹ |  | 0.86 |  |  | 0.49 |  |  | 0.59 |  |  | 0.38 |
Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 1,855 |  |  | $ | 1,395 |  |  | $ | 1,502 |  |  | $ | 1,712 |
Operating income |  | 334 |  |  | 229 |  |  | 271 |  |  | 231 |
Net income |  | 242 |  |  | 152 |  |  | 180 |  |  | 131 |
Preferred stock dividends |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income available to common stockholder |  | 242 |  |  | 151 |  |  | 180 |  |  | 130 |
1 | The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding.
(This page intentionally left blank)

X
- Definition [Line Items] for Quarterly Financial and Common Stock Information [Table] + References No definition available. + Details
Name: | cms_QuarterlyFinancialandCommonStockInformationLineItems
Namespace Prefix: | cms_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
Name: | us-gaap_QuarterlyFinancialInformationTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=cms_ConsumersEnergyCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |