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Reportable Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | $ 1,430 | $ 1,445 | $ 5,421 | $ 4,830 |
Total Net Income Available to Common Stockholders | 94 | 126 | 381 | 350 |
Plant, property, and equipment, gross | 17,155 |  | 17,155 |  | 16,184
Total Assets | 18,381 |  | 18,381 |  | 17,416
Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,359 | 1,386 | 5,128 | 4,647 |
Total Net Income Available to Common Stockholders | 119 | 152 | 448 | 413 |
Plant, property, and equipment, gross | 17,013 |  | 17,013 |  | 16,044
Total Assets | 16,919 |  | 16,919 |  | 16,179
Electric Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,153 | 1,188 | 3,428 | 3,175 |
Total Net Income Available to Common Stockholders | 128 | 156 | 326 | 315 |
Plant, property, and equipment, gross | 11,790 |  | 11,790 |  | 11,186
Total Assets | 11,029 |  | 11,029 |  | 10,487
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,153 | 1,188 | 3,428 | 3,175 |
Total Net Income Available to Common Stockholders | 128 | 156 | 326 | 315 |
Plant, property, and equipment, gross | 11,790 |  | 11,790 |  | 11,186
Total Assets | 11,029 |  | 11,029 |  | 10,487
Gas Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 206 | 198 | 1,699 | 1,472 |
Total Net Income Available to Common Stockholders | (9) | (4) | 121 | 97 |
Plant, property, and equipment, gross | 5,208 |  | 5,208 |  | 4,843
Total Assets | 5,242 |  | 5,242 |  | 4,784
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 206 | 198 | 1,699 | 1,472 |
Total Net Income Available to Common Stockholders | (9) | (4) | 121 | 97 |
Plant, property, and equipment, gross | 5,208 |  | 5,208 |  | 4,843
Total Assets | 5,242 |  | 5,242 |  | 4,784
Enterprises [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 51 | 44 | 235 | 136 |
Total Net Income Available to Common Stockholders | (7) | (4) | (3) | 1 |
Plant, property, and equipment, gross | 116 |  | 116 |  | 115
Total Assets | 318 |  | 318 |  | 332
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 20 | 15 | 59 | 47 |
Total Net Income Available to Common Stockholders | (18) | (22) | (63) | (63) |
Plant, property, and equipment, gross | 41 |  | 41 |  | 40
Total Assets | 1,792 |  | 1,792 |  | 1,813
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue |  |  | 1 |  |
Total Net Income Available to Common Stockholders |  |  | 1 | 1 |
Plant, property, and equipment, gross | 15 |  | 15 |  | 15
Total Assets | $ 648 |  | $ 648 |  | $ 908

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- Definition Carrying amount at the balance sheet date for long-lived assets used in the normal conduct of business and not intended for resale. This can include land, physical structures, machinery, vehicles, furniture, computer equipment, similar items, including certain intangible assets. Amount is not net of depreciation, depletion, and amortization, and does not include construction work in progress. + References No definition available. + Details
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