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Quarterly Financial And Common Stock Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial and Common Stock Information [Line Items] |
Schedule of Quarterly Financial Information Table |
In Millions, Except Per Share Amounts
| 2020
Three Months Ended | March 31 | June 30 | September 30 | December 31
CMS Energy, including Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 1,864 |  |  | $ | 1,443 |  |  | $ | 1,575 |  |  | $ | 1,798 |
Operating income |  | 368 |  |  | 273 |  |  | 369 |  |  | 352 |
Net income |  | 243 |  |  | 137 |  |  | 210 |  |  | 162 |
Income (loss) attributable to noncontrolling interests |  | — |  |  | 1 |  |  | (8) |  |  | 4 |
Net income available to common stockholders |  | 243 |  |  | 136 |  |  | 218 |  |  | 158 |
Basic earnings per average common share 1 |  | 0.86 |  |  | 0.48 |  |  | 0.76 |  |  | 0.55 |
Diluted earnings per average common share 1 |  | 0.85 |  |  | 0.48 |  |  | 0.76 |  |  | 0.55 |
Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 1,744 |  |  | $ | 1,330 |  |  | $ | 1,450 |  |  | $ | 1,665 |
Operating income |  | 329 |  |  | 246 |  |  | 338 |  |  | 308 |
Net income |  | 235 |  |  | 160 |  |  | 230 |  |  | 191 |
Preferred stock dividends |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income available to common stockholder |  | 235 |  |  | 159 |  |  | 230 |  |  | 190 |
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
| 2019
Three Months Ended | March 31 | June 30 | September 30 | December 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 share 1 |  | 0.75 |  |  | 0.33 |  |  | 0.73 |  |  | 0.59 |
Diluted earnings per average common share 1 |  | 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.
Consumers Energy Company |
Quarterly Financial and Common Stock Information [Line Items] |
Schedule of Quarterly Financial Information Table |
In Millions, Except Per Share Amounts
| 2020
Three Months Ended | March 31 | June 30 | September 30 | December 31
CMS Energy, including Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 1,864 |  |  | $ | 1,443 |  |  | $ | 1,575 |  |  | $ | 1,798 |
Operating income |  | 368 |  |  | 273 |  |  | 369 |  |  | 352 |
Net income |  | 243 |  |  | 137 |  |  | 210 |  |  | 162 |
Income (loss) attributable to noncontrolling interests |  | — |  |  | 1 |  |  | (8) |  |  | 4 |
Net income available to common stockholders |  | 243 |  |  | 136 |  |  | 218 |  |  | 158 |
Basic earnings per average common share 1 |  | 0.86 |  |  | 0.48 |  |  | 0.76 |  |  | 0.55 |
Diluted earnings per average common share 1 |  | 0.85 |  |  | 0.48 |  |  | 0.76 |  |  | 0.55 |
Consumers |  |  |  |  |  |  |  |
Operating revenue |  | $ | 1,744 |  |  | $ | 1,330 |  |  | $ | 1,450 |  |  | $ | 1,665 |
Operating income |  | 329 |  |  | 246 |  |  | 338 |  |  | 308 |
Net income |  | 235 |  |  | 160 |  |  | 230 |  |  | 191 |
Preferred stock dividends |  | — |  |  | 1 |  |  | — |  |  | 1 |
Net income available to common stockholder |  | 235 |  |  | 159 |  |  | 230 |  |  | 190 |
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
| 2019
Three Months Ended | March 31 | June 30 | September 30 | December 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 share 1 |  | 0.75 |  |  | 0.33 |  |  | 0.73 |  |  | 0.59 |
Diluted earnings per average common share 1 |  | 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.

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