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Consolidated Statements of Changes in Equity (USD $) In Millions | Consumers Energy Company [Member] CMS Energy Common Stock [Member] | Consumers Energy Company [Member] Other Paid-in Capital [Member] | Consumers Energy Company [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Consumers Energy Company [Member] Retirement benefits liability [Member] | Consumers Energy Company [Member] Investments [Member] | Consumers Energy Company [Member] Retained Earnings (Accumulated Deficit) [Member] | Consumers Energy Company [Member] Preferred Stock [Member] | Consumers Energy Company [Member] Comprehensive Income [Member] | Consumers Energy Company [Member] | CMS Energy Common Stock [Member] | Other Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retirement benefits liability [Member] | Investments [Member] | Derivative instruments [Member] | Retained Earnings (Accumulated Deficit) [Member] | Preferred Stock [Member] | Noncontrolling Interest [Member] | Comprehensive Income [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total Equity, beginning at Mar. 31, 2010 | $ 841 | $ 2,782 | $ (1) | $ (11) | $ 12 | $ 382 | $ 44 |  | $ 4,132 | $ 2 | $ 4,564 | $ (32) | $ (31) | $ 0 | $ (1) | $ (1,876) | $ 239 | $ 44 |  | $ 2,941
Common stock issued |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |
Stockholder's contribution |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 | 2
Retirement benefits liability adjustments, net of tax |  |  |  |  |  |  |  | 0 |  |  |  |  | 1 |  |  |  |  |  | 1 |
Unrealized gain (loss) on investments, net of tax |  |  |  |  | (1) |  |  | (1) |  |  |  |  |  | 0 |  |  |  |  | 0 |
Net Income |  |  |  |  |  | 88 |  | 88 | 88 |  |  |  |  |  |  | 82 |  |  | 84 | 84
Common stock dividends declared |  |  |  |  |  | (54) |  |  |  |  |  |  |  |  |  | (35) |  |  |  |
Preferred stock dividends declared |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  | (2) |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82 | 82
Total Comprehensive Income |  |  |  |  |  |  |  | 87 |  |  |  |  |  |  |  |  |  |  | 83 |
Total Equity, end at Jun. 30, 2010 | 841 | 2,832 | 0 | (11) | 11 | 415 | 44 |  | 4,132 | 2 | 4,569 | (31) | (30) | 0 | (1) | (1,831) | 239 | 45 |  | 2,993
Total Equity, beginning at Dec. 31, 2009 | 841 | 2,582 | (2) | (11) | 13 | 389 | 44 |  | 3,858 | 2 | 4,560 | (33) | (32) | 0 | (1) | (1,927) | 239 | 97 |  | 2,938
Common stock issued |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |
Stockholder's contribution |  | 250 |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 | 2
Retirement benefits liability adjustments, net of tax |  |  |  |  |  |  |  | 0 |  |  |  |  | 2 |  |  |  |  |  | 2 |
Unrealized gain (loss) on investments, net of tax |  |  |  |  | (2) |  |  | (2) |  |  |  |  |  | 0 |  |  |  |  | 0 |
Net Income |  |  |  |  |  | 195 |  | 195 | 195 |  |  |  |  |  |  | 170 |  |  | 172 | 172
Common stock dividends declared |  |  |  |  |  | (168) |  |  |  |  |  |  |  |  |  | (69) |  |  |  |
Preferred stock dividends declared |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  | (5) |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (54) |  |
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 170 | 170
Total Comprehensive Income |  |  |  |  |  |  |  | 193 |  |  |  |  |  |  |  |  |  |  | 172 |
Total Equity, end at Jun. 30, 2010 | 841 | 2,832 | 0 | (11) | 11 | 415 | 44 |  | 4,132 | 2 | 4,569 | (31) | (30) | 0 | (1) | (1,831) | 239 | 45 |  | 2,993
Total Equity, beginning at Dec. 31, 2010 | 841 | 2,832 | 0 | (16) | 16 | 463 | 44 |  | 4,180 | 2 | 4,588 | (40) | (39) | 0 | (1) | (1,757) | 0 | 44 |  | 2,837
Common stock issued |  |  |  |  |  |  |  |  |  | 1 | 28 |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Common stock reissued, value |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
Stockholder's contribution |  | 125 |  |  |  |  |  |  | 125 |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 1
Retirement benefits liability adjustments, net of tax |  |  |  | 1 |  |  |  | 1 |  |  |  |  | 1 |  |  |  |  |  | 1 |
Unrealized gain (loss) on investments, net of tax |  |  |  |  | (1) |  |  | (1) |  |  |  |  |  | 1 |  |  |  |  | 1 |
Net Income |  |  |  |  |  | 245 |  | 245 | 245 |  |  |  |  |  |  | 229 |  |  | 236 | 236
Common stock dividends declared |  |  |  |  |  | (196) |  |  |  |  |  |  |  |  |  | (106) |  |  |  |
Preferred stock dividends declared |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 235 | 235
Total Comprehensive Income |  |  |  |  |  |  |  | 245 |  |  |  |  |  |  |  |  |  |  | 237 |
Total Equity, end at Jun. 30, 2011 | 841 | 2,957 | 0 | (15) | 15 | 511 | 44 |  | 4,353 | 3 | 4,621 | (38) | (38) | 1 | (1) | (1,628) | 0 | 44 |  | 3,002
Total Equity, beginning at Mar. 31, 2011 | 841 | 2,957 | 0 | (15) | 15 | 512 | 44 |  | 4,354 | 3 | 4,599 | (40) | (39) | 0 | (1) | (1,675) | 0 | 44 |  | 2,931
Common stock issued |  |  |  |  |  |  |  |  |  |  | 22 |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Common stock reissued, value |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Stockholder's contribution |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 1
Retirement benefits liability adjustments, net of tax |  |  |  |  |  |  |  | 0 |  |  |  |  | 1 |  |  |  |  |  | 1 |
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  | 1 |  |  |  |  | 1 |
Net Income |  |  |  |  |  | 92 |  | 92 | 92 |  |  |  |  |  |  | 100 |  |  | 101 | 101
Common stock dividends declared |  |  |  |  |  | (92) |  |  |  |  |  |  |  |  |  | (53) |  |  |  |
Preferred stock dividends declared |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 | 100
Total Comprehensive Income |  |  |  |  |  |  |  | 92 |  |  |  |  |  |  |  |  |  |  | 102 |
Total Equity, end at Jun. 30, 2011 | $ 841 | $ 2,957 | $ 0 | $ (15) | $ 15 | $ 511 | $ 44 |  | $ 4,353 | $ 3 | $ 4,621 | $ (38) | $ (38) | $ 1 | $ (1) | $ (1,628) | $ 0 | $ 44 |  | $ 3,002

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