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Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | $ 1,587 | $ 1,486 | $ 4,759 | $ 4,947 |
Net Income Attributable to CMS Energy |  | 186 | 148 | 474 | 417 |
Plant, property, and equipment, gross |  | 20,698 |  | 20,698 |  | $ 18,943
Total Assets | [1] | 20,842 |  | 20,842 |  | 20,299
Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 1,498 | 1,417 | 4,514 | 4,726 |
Net income (loss) available to common stockholder |  | 195 | 160 | 498 | 458 |
Plant, property, and equipment, gross |  | 20,528 |  | 20,528 |  | 18,797
Total Assets | [1] | 18,980 |  | 18,980 |  | 18,635
Electric Utility [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 1,313 | 1,233 | 3,348 | 3,273 |
Net Income Attributable to CMS Energy |  | 191 | 166 | 395 | 342 |
Plant, property, and equipment, gross | [2] | 14,396 |  | 14,396 |  | 13,059
Total Assets | [2] | 12,892 |  | 12,892 |  | 12,660
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 1,313 | 1,233 | 3,348 | 3,273 |
Net income (loss) available to common stockholder |  | 191 | 166 | 395 | 342 |
Plant, property, and equipment, gross | [2] | 14,396 |  | 14,396 |  | 13,059
Total Assets | [2] | 12,892 |  | 12,892 |  | 12,660
Gas Utility [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 185 | 184 | 1,166 | 1,453 |
Net Income Attributable to CMS Energy |  | 3 | (7) | 102 | 115 |
Plant, property, and equipment, gross | [2] | 6,117 |  | 6,117 |  | 5,723
Total Assets | [2] | 6,033 |  | 6,033 |  | 5,912
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 185 | 184 | 1,166 | 1,453 |
Net income (loss) available to common stockholder |  | 3 | (7) | 102 | 115 |
Plant, property, and equipment, gross | [2] | 6,117 |  | 6,117 |  | 5,723
Total Assets | [2] | 6,033 |  | 6,033 |  | 5,912
Enterprises [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 59 | 43 | 156 | 148 |
Net Income Attributable to CMS Energy |  | 8 | 3 | 17 | 10 |
Plant, property, and equipment, gross |  | 158 |  | 158 |  | 120
Total Assets |  | 273 |  | 273 |  | 270
Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 30 | 26 | 89 | 73 |
Net Income Attributable to CMS Energy |  | (16) | (14) | (40) | (50) |
Plant, property, and equipment, gross |  | 27 |  | 27 |  | 41
Total Assets |  | 1,644 |  | 1,644 |  | 1,457
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net income (loss) available to common stockholder |  | 1 | $ 1 | 1 | $ 1 |
Plant, property, and equipment, gross |  | 15 |  | 15 |  | 15
Total Assets |  | $ 55 |  | $ 55 |  | $ 63
[1] | CMS Energy and Consumers changed the reporting of debt issuance costs on their consolidated balance sheets in accordance with ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, as of January 1, 2016, and retrospectively adjusted prior-period amounts for comparability. For further details on the implementation of this standard, see Note 1, New Accounting Standards.
[2] | Amounts include a portion of Consumers' other common assets attributable to both the electric and gas utility businesses.

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