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Reportable Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Operating Revenue | $ 1,406 | $ 1,333 | $ 3,385 | $ 3,076 |
Total Net Income Available to Common Stockholders | 80 | 100 | 224 | 167 |
Total Plant, Property, and Equipment, Gross | 16,086 |  | 16,086 |  | 15,592
Total Assets | 17,429 |  | 17,429 |  | 17,131
Consumers Energy Company [Member] |  |  |  |  |
Operating Revenue | 1,342 | 1,282 | 3,261 | 2,957 |
Total Net Income Available to Common Stockholders | 99 | 121 | 261 | 197 |
Total Plant, Property, and Equipment, Gross | 15,951 |  | 15,951 |  | 15,456
Total Assets | 16,409 |  | 16,409 |  | 16,275
Electric Utility [Member] |  |  |  |  |
Operating Revenue | 1,026 | 998 | 1,987 | 1,834 |
Total Net Income Available to Common Stockholders | 93 | 111 | 159 | 132 |
Total Plant, Property, and Equipment, Gross | 11,275 |  | 11,275 |  | 11,041
Total Assets | 10,769 |  | 10,769 |  | 10,423
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |
Operating Revenue | 1,026 | 998 | 1,987 | 1,834 |
Total Net Income Available to Common Stockholders | 93 | 111 | 159 | 132 |
Total Plant, Property, and Equipment, Gross | 11,275 |  | 11,275 |  | 11,041
Total Assets | 10,769 |  | 10,769 |  | 10,423
Gas Utility [Member] |  |  |  |  |
Operating Revenue | 316 | 284 | 1,274 | 1,123 |
Total Net Income Available to Common Stockholders | 5 | 9 | 101 | 64 |
Total Plant, Property, and Equipment, Gross | 4,661 |  | 4,661 |  | 4,400
Total Assets | 4,922 |  | 4,922 |  | 5,016
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |
Operating Revenue | 316 | 284 | 1,274 | 1,123 |
Total Net Income Available to Common Stockholders | 5 | 9 | 101 | 64 |
Total Plant, Property, and Equipment, Gross | 4,661 |  | 4,661 |  | 4,400
Total Assets | 4,922 |  | 4,922 |  | 5,016
Enterprises [Member] |  |  |  |  |
Operating Revenue | 48 | 38 | 92 | 92 |
Total Net Income Available to Common Stockholders | 1 | (1) | 5 | 4 |
Total Plant, Property, and Equipment, Gross | 112 |  | 112 |  | 113
Total Assets | 180 |  | 180 |  | 181
Other [Member] |  |  |  |  |
Operating Revenue | 16 | 13 | 32 | 27 |
Total Net Income Available to Common Stockholders | (19) | (19) | (41) | (33) |
Total Plant, Property, and Equipment, Gross | 38 |  | 38 |  | 38
Total Assets | 1,558 |  | 1,558 |  | 1,511
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |
Total Net Income Available to Common Stockholders | 1 | 1 | 1 | 1 |
Total Plant, Property, and Equipment, Gross | 15 |  | 15 |  | 15
Total Assets | $ 718 |  | $ 718 |  | $ 836

X
- 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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