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Reportable Segments (Reconciliation of Revenue from Segments to Consolidated) (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Operating Revenue | $ 1,464 | $ 1,443 | $ 4,883 | $ 4,750
Total Net Income Available to Common Stockholders | 139 | 134 | 374 | 299
Consumers Energy Company [Member] | Electric Utility [Member] |  |  |  |
Operating Revenue | 1,180 | 1,154 | 3,026 | 2,967
Total Net Income Available to Common Stockholders | 159 | 156 | 309 | 283
Electric Utility [Member] |  |  |  |
Operating Revenue | 1,180 | 1,154 | 3,026 | 2,967
Total Net Income Available to Common Stockholders | 159 | 156 | 309 | 283
Consumers Energy Company [Member] | Gas Utility [Member] |  |  |  |
Operating Revenue | 217 | 216 | 1,662 | 1,569
Total Net Income Available to Common Stockholders | (5) | 2 | 88 | 69
Gas Utility [Member] |  |  |  |
Operating Revenue | 217 | 216 | 1,662 | 1,569
Total Net Income Available to Common Stockholders | (5) | 2 | 88 | 69
Enterprises [Member] |  |  |  |
Operating Revenue | 56 | 63 | 161 | 186
Total Net Income Available to Common Stockholders | 4 | 9 | 36 | 51
Consumers Energy Company [Member] | Other [Member] |  |  |  |
Total Net Income Available to Common Stockholders |  | 1 | 1 | 1
Other [Member] |  |  |  |
Operating Revenue | 11 | 10 | 34 | 28
Total Net Income Available to Common Stockholders | (19) | (33) | (61) | (87)
Discontinued Operations [Member] |  |  |  |
Total Net Income Available to Common Stockholders |  |  | 2 | (17)
Consumers Energy Company [Member] |  |  |  |
Operating Revenue | 1,397 | 1,370 | 4,688 | 4,536
Total Net Income Available to Common Stockholders | $ 154 | $ 159 | $ 398 | $ 353

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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1377-109256 + Details
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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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