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Reportable Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | $ 1,445 |  | $ 1,507 | $ 4,830 |  | $ 4,583 |  |
Total Net Income Available to Common Stockholders | 126 |  | 148 | 350 |  | 315 |  |
Total Plant, Property, and Equipment, Gross | 16,566 |  |  | 16,566 |  |  | 15,592 |
Total Assets | 16,986 |  |  | 16,986 |  |  | 17,131 |
Consumers Energy Company [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 1,386 |  | 1,448 | 4,647 |  | 4,405 |  |
Total Net Income Available to Common Stockholders | 152 |  | 162 | 413 |  | 359 |  |
Total Plant, Property, and Equipment, Gross | 16,426 |  |  | 16,426 |  |  | 15,456 |
Total Assets | 16,094 |  |  | 16,094 |  |  | 16,275 |
Electric Utility [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 1,188 |  | 1,239 | 3,175 |  | 3,073 |  |
Total Net Income Available to Common Stockholders | 156 |  | 165 | 315 |  | 297 |  |
Total Plant, Property, and Equipment, Gross | 11,652 |  |  | 11,652 |  |  | 11,041 |
Total Assets | 10,412 | [1] |  | 10,412 | [1] |  | 10,423 | [1]
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 1,188 |  | 1,239 | 3,175 |  | 3,073 |  |
Total Net Income Available to Common Stockholders | 156 |  | 165 | 315 |  | 297 |  |
Total Plant, Property, and Equipment, Gross | 11,652 |  |  | 11,652 |  |  | 11,041 |
Total Assets | 10,412 | [1] |  | 10,412 | [1] |  | 10,423 | [1]
Gas Utility [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 198 |  | 209 | 1,472 |  | 1,332 |  |
Total Net Income Available to Common Stockholders | (4) |  | (3) | 97 |  | 61 |  |
Total Plant, Property, and Equipment, Gross | 4,759 |  |  | 4,759 |  |  | 4,400 |
Total Assets | 5,039 | [1] |  | 5,039 | [1] |  | 5,016 | [1]
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 198 |  | 209 | 1,472 |  | 1,332 |  |
Total Net Income Available to Common Stockholders | (4) |  | (3) | 97 |  | 61 |  |
Total Plant, Property, and Equipment, Gross | 4,759 |  |  | 4,759 |  |  | 4,400 |
Total Assets | 5,039 | [1] |  | 5,039 | [1] |  | 5,016 | [1]
Enterprises [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 44 |  | 44 | 136 |  | 136 |  |
Total Net Income Available to Common Stockholders | (4) |  | 5 | 1 |  | 9 |  |
Total Plant, Property, and Equipment, Gross | 116 |  |  | 116 |  |  | 113 |
Total Assets | 188 |  |  | 188 |  |  | 181 |
Other [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 15 |  | 15 | 47 |  | 42 |  |
Total Net Income Available to Common Stockholders | (22) |  | (19) | (63) |  | (52) |  |
Total Plant, Property, and Equipment, Gross | 39 |  |  | 39 |  |  | 38 |
Total Assets | 1,347 |  |  | 1,347 |  |  | 1,511 |
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total Net Income Available to Common Stockholders |  |  |  | 1 |  | 1 |  |
Total Plant, Property, and Equipment, Gross | 15 |  |  | 15 |  |  | 15 |
Total Assets | $ 643 |  |  | $ 643 |  |  | $ 836 |
[1] | Amounts include a portion of Consumers’ other common assets attributable to both the electric and gas utility businesses.

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