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Reportable Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | $ 1,468 |  | $ 1,406 | $ 3,991 |  | $ 3,385 |  |
Total Net Income Available to Common Stockholders | 83 |  | 80 | 287 |  | 224 |  |
Plant, property, and equipment, gross | 16,583 |  |  | 16,583 |  |  | 16,184 |
Total Assets | 17,719 |  |  | 17,719 |  |  | 17,416 |
Consumers Energy Company [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 1,387 |  | 1,342 | 3,769 |  | 3,261 |  |
Total Net Income Available to Common Stockholders | 108 |  | 99 | 329 |  | 261 |  |
Plant, property, and equipment, gross | 16,441 |  |  | 16,441 |  |  | 16,044 |
Total Assets | 16,387 |  |  | 16,387 |  |  | 16,179 |
Electric Utility [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 1,051 |  | 1,026 | 2,275 |  | 1,987 |  |
Total Net Income Available to Common Stockholders | 98 |  | 93 | 198 |  | 159 |  |
Plant, property, and equipment, gross | 11,424 | [1] |  | 11,424 | [1] |  | 11,186 | [1]
Total Assets | 10,787 | [1] |  | 10,787 | [1] |  | 10,487 | [1]
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 1,051 |  | 1,026 | 2,275 |  | 1,987 |  |
Total Net Income Available to Common Stockholders | 98 |  | 93 | 198 |  | 159 |  |
Plant, property, and equipment, gross | 11,424 | [1] |  | 11,424 | [1] |  | 11,186 | [1]
Total Assets | 10,787 | [1] |  | 10,787 | [1] |  | 10,487 | [1]
Gas Utility [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 335 |  | 316 | 1,493 |  | 1,274 |  |
Total Net Income Available to Common Stockholders | 9 |  | 5 | 130 |  | 101 |  |
Plant, property, and equipment, gross | 5,002 | [1] |  | 5,002 | [1] |  | 4,843 | [1]
Total Assets | 4,837 | [1] |  | 4,837 | [1] |  | 4,784 | [1]
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 335 |  | 316 | 1,493 |  | 1,274 |  |
Total Net Income Available to Common Stockholders | 9 |  | 5 | 130 |  | 101 |  |
Plant, property, and equipment, gross | 5,002 | [1] |  | 5,002 | [1] |  | 4,843 | [1]
Total Assets | 4,837 | [1] |  | 4,837 | [1] |  | 4,784 | [1]
Enterprises [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 62 |  | 48 | 184 |  | 92 |  |
Total Net Income Available to Common Stockholders | 2 |  | 1 | 4 |  | 5 |  |
Plant, property, and equipment, gross | 116 |  |  | 116 |  |  | 115 |
Total Assets | 314 |  |  | 314 |  |  | 332 |
Other [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 20 |  | 16 | 39 |  | 32 |  |
Total Net Income Available to Common Stockholders | (26) |  | (19) | (45) |  | (41) |  |
Plant, property, and equipment, gross | 41 |  |  | 41 |  |  | 40 |
Total Assets | 1,781 |  |  | 1,781 |  |  | 1,813 |
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating Revenue | 1 |  |  | 1 |  |  |  |
Total Net Income Available to Common Stockholders | 1 |  | 1 | 1 |  | 1 |  |
Plant, property, and equipment, gross | 15 |  |  | 15 |  |  | 15 |
Total Assets | $ 763 |  |  | $ 763 |  |  | $ 908 |
[1] | Amounts include a portion of Consumers’ other common assets attributable to both the electric and gas utility businesses.

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