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Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | $ 1,350 | $ 1,468 | $ 3,461 | $ 3,991 |
Net Income Attributable to CMS Energy |  | 67 | 83 | 269 | 287 |
Plant, property, and equipment, gross |  | 18,217 |  | 18,217 |  | $ 17,721
Total Assets |  | 19,238 |  | 19,238 |  | 19,185
Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 1,281 | 1,387 | 3,309 | 3,769 |
Net Income Available to Common Stockholders |  | 83 | 108 | 298 | 329 |
Plant, property, and equipment, gross |  | 18,074 |  | 18,074 |  | 17,580
Total Assets |  | 17,867 |  | 17,867 |  | 17,847
Electric Utility [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 1,007 | 1,051 | 2,040 | 2,275 |
Net Income Attributable to CMS Energy |  | 82 | 98 | 176 | 198 |
Plant, property, and equipment, gross | [1] | 12,597 |  | 12,597 |  | 12,230
Total Assets | [1] | 11,906 |  | 11,906 |  | 11,582
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 1,007 | 1,051 | 2,040 | 2,275 |
Net Income Available to Common Stockholders |  | 82 | 98 | 176 | 198 |
Plant, property, and equipment, gross | [1] | 12,597 |  | 12,597 |  | 12,230
Total Assets | [1] | 11,906 |  | 11,906 |  | 11,582
Gas Utility [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 274 | 335 | 1,269 | 1,493 |
Net Income Attributable to CMS Energy |  | 1 | 9 | 122 | 130 |
Plant, property, and equipment, gross | [1] | 5,462 |  | 5,462 |  | 5,335
Total Assets | [1] | 5,309 |  | 5,309 |  | 5,391
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 274 | 335 | 1,269 | 1,493 |
Net Income Available to Common Stockholders |  | 1 | 9 | 122 | 130 |
Plant, property, and equipment, gross | [1] | 5,462 |  | 5,462 |  | 5,335
Total Assets | [1] | 5,309 |  | 5,309 |  | 5,391
Enterprises [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 45 | 62 | 105 | 184 |
Net Income Attributable to CMS Energy |  |  | 2 | 7 | 4 |
Plant, property, and equipment, gross |  | 118 |  | 118 |  | 115
Total Assets |  | 267 |  | 267 |  | 231
Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 24 | 20 | 47 | 39 |
Net Income Attributable to CMS Energy |  | (16) | (26) | (36) | (45) |
Plant, property, and equipment, gross |  | 40 |  | 40 |  | 41
Total Assets |  | 1,756 |  | 1,756 |  | 1,981
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  |  | 1 |  | 1 |
Net Income Available to Common Stockholders |  |  | $ 1 |  | $ 1 |
Plant, property, and equipment, gross |  | 15 |  | 15 |  | 15
Total Assets |  | $ 652 |  | $ 652 |  | $ 874
[1] | Amounts include a portion of Consumers' other common assets attributable to both the electric and gas utility businesses.

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