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Reportable Segments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | $ 1,801 | $ 2,111 |
Depreciation and amortization |  | 238 | 222 |
Income (loss) from equity method investees |  | 4 | 4 |
Interest charges |  | 106 | 101 |
Income tax expense (benefit) |  | 74 | 100 |
Net income available to common stockholders |  | 164 | 202 |
Plant, property, and equipment, gross |  | 19,334 |  | $ 18,943
Investments in equity method investees |  | 64 |  | 64
Total Assets | [1] | 20,037 |  | 20,299
Consumers Energy Company [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 1,723 | 2,028 |
Depreciation and amortization |  | 237 | 220 |
Interest charges |  | 67 | 65 |
Income tax expense (benefit) |  | 82 | 110 |
Net income available to common stockholders |  | 172 | 215 |
Plant, property, and equipment, gross |  | 19,165 |  | 18,797
Total Assets | [1] | 18,422 |  | 18,635
Electric Utility [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 1,013 | 1,033 |
Net income available to common stockholders |  | 91 | 94 |
Plant, property, and equipment, gross | [2] | 13,331 |  | 13,059
Total Assets | [2] | 12,743 |  | 12,660
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 1,013 | 1,033 |
Net income available to common stockholders |  | 91 | 94 |
Plant, property, and equipment, gross | [2] | 13,331 |  | 13,059
Total Assets | [2] | 12,744 |  | 12,660
Gas Utility [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 710 | 995 |
Net income available to common stockholders |  | 81 | 121 |
Plant, property, and equipment, gross | [2] | 5,819 |  | 5,723
Total Assets | [2] | 5,624 |  | 5,912
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 710 | 995 |
Net income available to common stockholders |  | 81 | 121 |
Plant, property, and equipment, gross | [2] | 5,819 |  | 5,723
Total Assets | [2] | 5,624 |  | 5,912
Enterprises [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 48 | 60 |
Net income available to common stockholders |  | 6 | 7 |
Plant, property, and equipment, gross |  | 159 |  | 120
Total Assets |  | 261 |  | 270
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Revenue |  | 30 | 23 |
Net income available to common stockholders |  | (14) | $ (20) |
Plant, property, and equipment, gross |  | 25 |  | 41
Total Assets |  | 1,409 |  | 1,457
Other [Member] | Consumers Energy Company [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Plant, property, and equipment, gross |  | 15 |  | 15
Total Assets |  | $ 54 |  | $ 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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