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Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | $ 1,371 | $ 1,350 | $ 3,172 | $ 3,461 |
Income (loss) from equity method investees |  | 3 | 1 | 7 | 5 |
Net Income Attributable to CMS Energy |  | 124 | 67 | 288 | 269 |
Plant, property, and equipment, gross |  | 20,497 |  | 20,497 |  | $ 18,943
Investments in equity method investees |  | 66 |  | 66 |  | 64
Total Assets | [1] | 20,463 |  | 20,463 |  | 20,299
Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 1,293 | 1,281 | 3,016 | 3,309 |
Net Income Available to Common Stockholders |  | 131 | 83 | 303 | 298 |
Plant, property, and equipment, gross |  | 20,326 |  | 20,326 |  | 18,797
Total Assets | [1] | 18,702 |  | 18,702 |  | 18,635
Electric Utility [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 1,022 | 1,007 | 2,035 | 2,040 |
Net Income Attributable to CMS Energy |  | 113 | 82 | 204 | 176 |
Plant, property, and equipment, gross | [2] | 14,297 |  | 14,297 |  | 13,059
Total Assets | [2] | 12,901 |  | 12,901 |  | 12,660
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 1,022 | 1,007 | 2,035 | 2,040 |
Net Income Available to Common Stockholders |  | 113 | 82 | 204 | 176 |
Plant, property, and equipment, gross | [2] | 14,297 |  | 14,297 |  | 13,059
Total Assets | [2] | 12,902 |  | 12,902 |  | 12,660
Gas Utility [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 271 | 274 | 981 | 1,269 |
Net Income Attributable to CMS Energy |  | 18 | 1 | 99 | 122 |
Plant, property, and equipment, gross | [2] | 6,014 |  | 6,014 |  | 5,723
Total Assets | [2] | 5,744 |  | 5,744 |  | 5,912
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 271 | 274 | 981 | 1,269 |
Net Income Available to Common Stockholders |  | 18 | 1 | 99 | 122 |
Plant, property, and equipment, gross | [2] | 6,014 |  | 6,014 |  | 5,723
Total Assets | [2] | 5,744 |  | 5,744 |  | 5,912
Enterprises [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 49 | 45 | 97 | 105 |
Net Income Attributable to CMS Energy |  | 3 |  | 9 | 7 |
Plant, property, and equipment, gross |  | 160 |  | 160 |  | 120
Total Assets |  | 267 |  | 267 |  | 270
Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating Revenue |  | 29 | 24 | 59 | 47 |
Net Income Attributable to CMS Energy |  | (10) | $ (16) | (24) | $ (36) |
Plant, property, and equipment, gross |  | 26 |  | 26 |  | 41
Total Assets |  | 1,551 |  | 1,551 |  | 1,457
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Plant, property, and equipment, gross |  | 15 |  | 15 |  | 15
Total Assets |  | $ 56 |  | $ 56 |  | $ 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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