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Quarterly Financial and Common Stock Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2011
Schedule of Quarterly Financial Information Table |
|  | In Millions, Except Per Share Amounts and Stock Prices |
|  | 2011 |
Quarters Ended |  | March 31 |  |  | June 30 |  |  | Sept. 30 |  |  | Dec. 31 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 2,055 |  |  | $ | 1,364 |  |  | $ | 1,464 |  |  | $ | 1,620 |
Operating Income |  |  | 306 |  |  |  | 207 |  |  |  | 316 |  |  |  | 174 |
Income From Continuing Operations |  |  | 133 |  |  |  | 101 |  |  |  | 140 |  |  |  | 41 |
Income From Discontinued Operations |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | - |
Net Income |  |  | 135 |  |  |  | 101 |  |  |  | 140 |  |  |  | 41 |
Income Attributable to Noncontrolling Interests |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Attributable to CMS Energy |  |  | 135 |  |  |  | 100 |  |  |  | 139 |  |  |  | 41 |
Net income Available to Common Stockholders |  |  | 135 |  |  |  | 100 |  |  |  | 139 |  |  |  | 41 |
Earnings From Continuing Operations Per Average Common Share – Basic 1 |  |  | 0.53 |  |  |  | 0.40 |  |  |  | 0.55 |  |  |  | 0.16 |
Earnings From Continuing Operations Per Average Common Share – Diluted 1 |  |  | 0.51 |  |  |  | 0.38 |  |  |  | 0.53 |  |  |  | 0.15 |
Basic Earnings Per Average Common Share 1 |  |  | 0.54 |  |  |  | 0.40 |  |  |  | 0.55 |  |  |  | 0.16 |
Diluted Earnings Per Average Common Share 1 |  |  | 0.52 |  |  |  | 0.38 |  |  |  | 0.53 |  |  |  | 0.15 |
Common stock prices 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  |  | 19.78 |  |  |  | 20.39 |  |  |  | 20.47 |  |  |  | 22.35 |
Low |  |  | 18.60 |  |  |  | 18.90 |  |  |  | 17.16 |  |  |  | 19.18 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,988 |  |  | $ | 1,303 |  |  | $ | 1,397 |  |  | $ | 1,565 |
Operating Income |  |  | 300 |  |  |  | 207 |  |  |  | 305 |  |  |  | 173 |
Net Income |  |  | 153 |  |  |  | 92 |  |  |  | 155 |  |  |  | 67 |
Preferred Stock Dividends |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Available to Common Stockholder |  |  | 153 |  |  |  | 91 |  |  |  | 154 |  |  |  | 67 |
|  | In Millions, Except Per Share Amounts and Stock Prices |
|  | 2010 |
Quarters Ended |  | March 31 |  |  | June 30 |  |  | Sept. 30 |  |  | Dec. 31 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,967 |  |  | $ | 1,340 |  |  | $ | 1,443 |  |  | $ | 1,682 |
Operating Income |  |  | 239 |  |  |  | 262 |  |  |  | 319 |  |  |  | 158 |
Income From Continuing Operations |  |  | 89 |  |  |  | 100 |  |  |  | 146 |  |  |  | 31 |
Loss From Discontinued Operations |  |  | (1 | ) |  |  | (16 | ) |  |  | - |  |  |  | (6) |
Net Income |  |  | 88 |  |  |  | 84 |  |  |  | 146 |  |  |  | 25 |
Income Attributable to Noncontrolling Interests |  |  | - |  |  |  | 2 |  |  |  | 1 |  |  |  | - |
Net Income Attributable to CMS Energy |  |  | 88 |  |  |  | 82 |  |  |  | 145 |  |  |  | 25 |
Charge for Deferred Issuance Cost on Preferred Stock |  |  | - |  |  |  | - |  |  |  | 8 |  |  |  | - |
Preferred Stock Dividends |  |  | 3 |  |  |  | 2 |  |  |  | 3 |  |  |  | - |
Net Income Available to Common Stockholders |  |  | 85 |  |  |  | 80 |  |  |  | 134 |  |  |  | 25 |
Earnings From Continuing Operations Per Average Common Share – Basic 1 |  |  | 0.38 |  |  |  | 0.42 |  |  |  | 0.58 |  |  |  | 0.13 |
Earnings From Continuing Operations Per Average Common Share – Diluted 1 |  |  | 0.35 |  |  |  | 0.39 |  |  |  | 0.53 |  |  |  | 0.11 |
Basic Earnings Per Average Common Share 1 |  |  | 0.37 |  |  |  | 0.35 |  |  |  | 0.58 |  |  |  | 0.11 |
Diluted Earnings Per Average Common Share 1 |  |  | 0.34 |  |  |  | 0.32 |  |  |  | 0.53 |  |  |  | 0.09 |
Common stock prices 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  |  | 15.90 |  |  |  | 16.55 |  |  |  | 18.15 |  |  |  | 19.16 |
Low |  |  | 14.57 |  |  |  | 14.26 |  |  |  | 14.68 |  |  |  | 17.72 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,890 |  |  | $ | 1,276 |  |  | $ | 1,370 |  |  | $ | 1,620 |
Operating Income |  |  | 224 |  |  |  | 207 |  |  |  | 304 |  |  |  | 191 |
Net Income |  |  | 107 |  |  |  | 88 |  |  |  | 160 |  |  |  | 79 |
Preferred Stock Dividends |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Available to Common Stockholder |  |  | 107 |  |  |  | 87 |  |  |  | 159 |  |  |  | 79 |
1 The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding. 2 Based on New York Stock Exchange composite transactions.
Consumers Energy Company [Member] |
Schedule of Quarterly Financial Information Table |
|  | In Millions, Except Per Share Amounts and Stock Prices |
|  | 2011 |
Quarters Ended |  | March 31 |  |  | June 30 |  |  | Sept. 30 |  |  | Dec. 31 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 2,055 |  |  | $ | 1,364 |  |  | $ | 1,464 |  |  | $ | 1,620 |
Operating Income |  |  | 306 |  |  |  | 207 |  |  |  | 316 |  |  |  | 174 |
Income From Continuing Operations |  |  | 133 |  |  |  | 101 |  |  |  | 140 |  |  |  | 41 |
Income From Discontinued Operations |  |  | 2 |  |  |  | - |  |  |  | - |  |  |  | - |
Net Income |  |  | 135 |  |  |  | 101 |  |  |  | 140 |  |  |  | 41 |
Income Attributable to Noncontrolling Interests |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Attributable to CMS Energy |  |  | 135 |  |  |  | 100 |  |  |  | 139 |  |  |  | 41 |
Net income Available to Common Stockholders |  |  | 135 |  |  |  | 100 |  |  |  | 139 |  |  |  | 41 |
Earnings From Continuing Operations Per Average Common Share – Basic 1 |  |  | 0.53 |  |  |  | 0.40 |  |  |  | 0.55 |  |  |  | 0.16 |
Earnings From Continuing Operations Per Average Common Share – Diluted 1 |  |  | 0.51 |  |  |  | 0.38 |  |  |  | 0.53 |  |  |  | 0.15 |
Basic Earnings Per Average Common Share 1 |  |  | 0.54 |  |  |  | 0.40 |  |  |  | 0.55 |  |  |  | 0.16 |
Diluted Earnings Per Average Common Share 1 |  |  | 0.52 |  |  |  | 0.38 |  |  |  | 0.53 |  |  |  | 0.15 |
Common stock prices 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  |  | 19.78 |  |  |  | 20.39 |  |  |  | 20.47 |  |  |  | 22.35 |
Low |  |  | 18.60 |  |  |  | 18.90 |  |  |  | 17.16 |  |  |  | 19.18 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,988 |  |  | $ | 1,303 |  |  | $ | 1,397 |  |  | $ | 1,565 |
Operating Income |  |  | 300 |  |  |  | 207 |  |  |  | 305 |  |  |  | 173 |
Net Income |  |  | 153 |  |  |  | 92 |  |  |  | 155 |  |  |  | 67 |
Preferred Stock Dividends |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Available to Common Stockholder |  |  | 153 |  |  |  | 91 |  |  |  | 154 |  |  |  | 67 |
|  | In Millions, Except Per Share Amounts and Stock Prices |
|  | 2010 |
Quarters Ended |  | March 31 |  |  | June 30 |  |  | Sept. 30 |  |  | Dec. 31 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,967 |  |  | $ | 1,340 |  |  | $ | 1,443 |  |  | $ | 1,682 |
Operating Income |  |  | 239 |  |  |  | 262 |  |  |  | 319 |  |  |  | 158 |
Income From Continuing Operations |  |  | 89 |  |  |  | 100 |  |  |  | 146 |  |  |  | 31 |
Loss From Discontinued Operations |  |  | (1 | ) |  |  | (16 | ) |  |  | - |  |  |  | (6) |
Net Income |  |  | 88 |  |  |  | 84 |  |  |  | 146 |  |  |  | 25 |
Income Attributable to Noncontrolling Interests |  |  | - |  |  |  | 2 |  |  |  | 1 |  |  |  | - |
Net Income Attributable to CMS Energy |  |  | 88 |  |  |  | 82 |  |  |  | 145 |  |  |  | 25 |
Charge for Deferred Issuance Cost on Preferred Stock |  |  | - |  |  |  | - |  |  |  | 8 |  |  |  | - |
Preferred Stock Dividends |  |  | 3 |  |  |  | 2 |  |  |  | 3 |  |  |  | - |
Net Income Available to Common Stockholders |  |  | 85 |  |  |  | 80 |  |  |  | 134 |  |  |  | 25 |
Earnings From Continuing Operations Per Average Common Share – Basic 1 |  |  | 0.38 |  |  |  | 0.42 |  |  |  | 0.58 |  |  |  | 0.13 |
Earnings From Continuing Operations Per Average Common Share – Diluted 1 |  |  | 0.35 |  |  |  | 0.39 |  |  |  | 0.53 |  |  |  | 0.11 |
Basic Earnings Per Average Common Share 1 |  |  | 0.37 |  |  |  | 0.35 |  |  |  | 0.58 |  |  |  | 0.11 |
Diluted Earnings Per Average Common Share 1 |  |  | 0.34 |  |  |  | 0.32 |  |  |  | 0.53 |  |  |  | 0.09 |
Common stock prices 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High |  |  | 15.90 |  |  |  | 16.55 |  |  |  | 18.15 |  |  |  | 19.16 |
Low |  |  | 14.57 |  |  |  | 14.26 |  |  |  | 14.68 |  |  |  | 17.72 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  | $ | 1,890 |  |  | $ | 1,276 |  |  | $ | 1,370 |  |  | $ | 1,620 |
Operating Income |  |  | 224 |  |  |  | 207 |  |  |  | 304 |  |  |  | 191 |
Net Income |  |  | 107 |  |  |  | 88 |  |  |  | 160 |  |  |  | 79 |
Preferred Stock Dividends |  |  | - |  |  |  | 1 |  |  |  | 1 |  |  |  | - |
Net Income Available to Common Stockholder |  |  | 107 |  |  |  | 87 |  |  |  | 159 |  |  |  | 79 |
1 The sum of the quarters may not equal annual EPS due to changes in the number of shares outstanding. 2 Based on New York Stock Exchange composite transactions.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 270 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a)-(j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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