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v2.3.0.11

Reportable Segments (Reconciliation of Revenue from Segments to Consolidated) (Details) (USD $) In Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Operating Revenue | $ 1,364 | $ 1,340 | $ 3,419 | $ 3,307
Total Net Income Available to Common Stockholders | 100 | 80 | 235 | 165
Consumers Energy Company [Member] | Electric Utility [Member] |  |  |  |
Operating Revenue | 949 | 975 | 1,846 | 1,813
Total Net Income Available to Common Stockholders | 85 | 86 | 150 | 127
Electric Utility [Member] |  |  |  |
Operating Revenue | 949 | 975 | 1,846 | 1,813
Total Net Income Available to Common Stockholders | 85 | 86 | 150 | 127
Consumers Energy Company [Member] | Gas Utility [Member] |  |  |  |
Operating Revenue | 354 | 301 | 1,445 | 1,353
Total Net Income Available to Common Stockholders | 5 | 1 | 93 | 67
Gas Utility [Member] |  |  |  |
Operating Revenue | 354 | 301 | 1,445 | 1,353
Total Net Income Available to Common Stockholders | 5 | 1 | 93 | 67
Enterprises [Member] |  |  |  |
Operating Revenue | 50 | 55 | 105 | 123
Total Net Income Available to Common Stockholders | 29 | 33 | 32 | 42
Consumers Energy Company [Member] | Other [Member] |  |  |  |
Total Net Income Available to Common Stockholders | 1 |  | 1 |
Other [Member] |  |  |  |
Operating Revenue | 11 | 9 | 23 | 18
Total Net Income Available to Common Stockholders | (19) | (24) | (42) | (54)
Discontinued Operations [Member] |  |  |  |
Total Net Income Available to Common Stockholders |  | (16) | 2 | (17)
Consumers Energy Company [Member] |  |  |  |
Operating Revenue | 1,303 | 1,276 | 3,291 | 3,166
Total Net Income Available to Common Stockholders | $ 91 | $ 87 | $ 244 | $ 194

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