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Reportable Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | $ 2,523 |  | $ 1,979 |  |
Total Net Income Available to Common Stockholders | 204 |  | 144 |  |
Plant, property, and equipment, gross | 16,322 |  |  | 16,184 |
Total Assets | 17,924 |  |  | 17,416 |
Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 2,382 |  | 1,919 |  |
Total Net Income Available to Common Stockholders | 221 |  | 162 |  |
Plant, property, and equipment, gross | 16,181 |  |  | 16,044 |
Total Assets | 16,312 |  |  | 16,179 |
Electric Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,224 |  | 961 |  |
Total Net Income Available to Common Stockholders | 100 |  | 66 |  |
Plant, property, and equipment, gross | 11,270 |  |  | 11,186 |
Total Assets | 10,719 | [1] |  | 10,487 | [1]
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,224 |  | 961 |  |
Total Net Income Available to Common Stockholders | 100 |  | 66 |  |
Plant, property, and equipment, gross | 11,270 |  |  | 11,186 |
Total Assets | 10,719 | [1] |  | 10,487 | [1]
Gas Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,158 |  | 958 |  |
Total Net Income Available to Common Stockholders | 121 |  | 96 |  |
Plant, property, and equipment, gross | 4,896 |  |  | 4,843 |
Total Assets | 4,554 | [1] |  | 4,784 | [1]
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,158 |  | 958 |  |
Total Net Income Available to Common Stockholders | 121 |  | 96 |  |
Plant, property, and equipment, gross | 4,896 |  |  | 4,843 |
Total Assets | 4,554 | [1] |  | 4,784 | [1]
Enterprises [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 122 |  | 44 |  |
Total Net Income Available to Common Stockholders | 2 |  | 4 |  |
Plant, property, and equipment, gross | 116 |  |  | 115 |
Total Assets | 310 |  |  | 332 |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 19 |  | 16 |  |
Total Net Income Available to Common Stockholders | (19) |  | (22) |  |
Plant, property, and equipment, gross | 40 |  |  | 40 |
Total Assets | 2,341 |  |  | 1,813 |
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Plant, property, and equipment, gross | 15 |  |  | 15 |
Total Assets | $ 1,039 |  |  | $ 908 |
[1] | Amounts include a portion of Consumers’ other common assets attributable to both the electric and gas utility businesses

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