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Consolidated Statements of Changes in Equity (USD $) In Millions, except Share data | 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 Dec. 31, 2008 | $ 841 | $ 2,482 | $ (1) | $ (7) | $ 6 | $ 383 | $ 44 |  | $ 3,749 | $ 2 | $ 4,533 | $ (28) | $ (27) |  | $ (1) | $ (2,031) | $ 243 | $ 96 |  | $ 2,815
Beginning of period, shares at Dec. 31, 2008 |  |  |  |  |  |  |  |  |  |  | 226,414,000 |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  |  |  |  |  |  |  | 1,793,000 |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |  |
Common stock reissued, shares |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Common stock reissued, value |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Common stock repurchased, shares |  |  |  |  |  |  |  |  |  |  | (78,000) |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |
Common stock reacquired, shares |  |  |  |  |  |  |  |  |  |  | (238,000) |  |  |  |  |  |  |  |  |
Common stock reacquired, value |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Conversion option on convertible debt |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  |  |
Charge for deferred issuance costs |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |
Stockholder's contribution |  | 100 |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 | 11 | 11
Net gain (loss) arising during the period |  |  |  | (4) |  |  |  | (4) |  |  |  |  | (6) |  |  |  |  |  | (6) |
Amortization of net actuarial loss |  |  |  | 0 |  |  |  | 0 |  |  |  |  | 1 |  |  |  |  |  | 1 |
Prior service credit adjustment |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 10 |  |  | 10 |  |  |  |  |  | 5 |  |  |  |  | 5 |
Reclassification adjustments included in net income (loss), net of tax |  |  |  |  | (3) |  |  | (3) | 3 |  |  |  |  | (5) |  |  |  |  | (5) | 5
Net income |  |  |  |  |  | 293 |  | 293 | 293 |  |  |  |  |  |  |  |  |  | 240 | 240
Common stock dividends declared |  |  |  |  |  | (285) |  |  |  |  |  |  |  |  |  | (114) |  |  |  |
Preferred stock dividends declared |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  | (11) |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10) |  |
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 229 |  |  | 229 | 229
Total Comprehensive Income |  |  |  |  |  |  |  | 296 |  |  |  |  |  |  |  |  |  |  | 224 |
Conversion of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4) |  |  |
Total Equity, end 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
End of period, shares at Dec. 31, 2009 |  |  |  |  |  |  |  |  |  |  | 227,891,000 |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 107 |  |  |  |  |  |  |  |  |  |  | 88
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88
Total Equity, end at Mar. 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Beginning of period, shares at Dec. 31, 2009 |  |  |  |  |  |  |  |  |  |  | 227,891,000 |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  |  |  |  |  |  |  | 22,090,000 |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  |  | 22 |  |  |  |  |  |  |  |  |
Common stock reissued, shares |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Common stock reissued, value |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Common stock repurchased, shares |  |  |  |  |  |  |  |  |  |  | (148,000) |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |
Common stock reacquired, shares |  |  |  |  |  |  |  |  |  |  | (205,000) |  |  |  |  |  |  |  |  |
Common stock reacquired, value |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Conversion option on convertible debt |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Charge for deferred issuance costs |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  | (8) |  |  |  |
Stockholder's contribution |  | 250 |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 | 3
Net gain (loss) arising during the period |  |  |  | (5) |  |  |  | (5) |  |  |  |  | (9) |  |  |  |  |  | (9) |
Amortization of net actuarial loss |  |  |  | 0 |  |  |  | 0 |  |  |  |  | 1 |  |  |  |  |  | 1 |
Prior service credit adjustment |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 1 |
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 3 |  |  | 3 |  |  |  |  |  | 0 |  |  |  |  | 0 |
Reclassification adjustments included in net income (loss), net of tax |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  | 0 |
Net income |  |  |  |  |  | 434 |  | 434 | 434 |  |  |  |  |  |  |  |  |  | 343 | 343
Common stock dividends declared |  |  |  |  |  | (358) |  |  |  |  |  |  |  |  |  | (154) |  |  |  |
Preferred stock dividends declared |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  | (8) |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (56) |  |
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 340 |  |  | 340 | 340
Total Comprehensive Income |  |  |  |  |  |  |  | 432 |  |  |  |  |  |  |  |  |  |  | 333 |
Conversion of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (239) |  |  |
Total Equity, end 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
End of period, shares at Dec. 31, 2010 |  |  |  |  |  |  |  |  |  |  | 249,628,000 |  |  |  |  |  |  |  |  |
Total Equity, beginning at Mar. 31, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Net income |  |  |  |  |  |  |  |  | 88 |  |  |  |  |  |  |  |  |  |  | 84
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82
Total Equity, end at Jun. 30, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Net income |  |  |  |  |  |  |  |  | 160 |  |  |  |  |  |  |  |  |  |  | 146
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 145
Total Equity, end at Sep. 30, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 79 |  |  |  |  |  |  |  |  |  |  | 25
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25
Total Equity, end at Dec. 31, 2010 |  |  | 0 |  |  |  | 44 |  | 4,180 |  |  | (40) |  |  | (1) |  |  |  |  | 2,837
Net income |  |  |  |  |  |  |  |  | 153 |  |  |  |  |  |  |  |  |  |  | 135
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135
Total Equity, end at Mar. 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Beginning of period, shares at Dec. 31, 2010 |  |  |  |  |  |  |  |  |  |  | 249,628,000 |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  |  |  |  |  |  |  | 4,541,000 |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 1 | 40 |  |  |  |  |  |  |  |  |
Common stock reissued, shares |  |  |  |  |  |  |  |  |  |  | 269,000 |  |  |  |  |  |  |  |  |
Common stock reissued, value |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
Common stock repurchased, shares |  |  |  |  |  |  |  |  |  |  | (323,000) |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  | (6) |  |  |  |  |  |  |  |  |
Common stock reacquired, shares |  |  |  |  |  |  |  |  |  |  | (15,000) |  |  |  |  |  |  |  |  |
Common stock reacquired, value |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Conversion option on convertible debt |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Charge for deferred issuance costs |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |
Stockholder's contribution |  | 125 |  |  |  |  |  |  | 125 |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 | 2
Net gain (loss) arising during the period |  |  |  | (4) |  |  |  | (4) |  |  |  |  | (11) |  |  |  |  |  | (11) |
Amortization of net actuarial loss |  |  |  | 1 |  |  |  | 1 |  |  |  |  | 2 |  |  |  |  |  | 2 |
Prior service credit adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 1 |  |  | 1 |  |  |  |  |  | 0 |  |  |  |  | 0 |
Reclassification adjustments included in net income (loss), net of tax |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  | 0 |  |  |  |  | 0 |
Net income |  |  |  |  |  | 467 |  | 467 | 467 |  |  |  |  |  |  |  |  |  | 417 | 417
Common stock dividends declared |  |  |  |  |  | (374) |  |  |  |  |  |  |  |  |  | (211) |  |  |  |
Preferred stock dividends declared |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 415 |  |  | 415 | 415
Total Comprehensive Income |  |  |  |  |  |  |  | 465 |  |  |  |  |  |  |  |  |  |  | 406 |
Conversion of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Total Equity, end at Dec. 31, 2011 | 841 | 2,957 | (2) | (19) | 17 | 554 | 44 |  | 4,394 | 3 | 4,627 | (49) | (48) | 0 | (1) | (1,553) | 0 | 44 |  | 3,072
End of period, shares at Dec. 31, 2011 |  |  |  |  |  |  |  |  |  |  | 254,100,000 |  |  |  |  |  |  |  |  |
Total Equity, beginning at Mar. 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Net income |  |  |  |  |  |  |  |  | 92 |  |  |  |  |  |  |  |  |  |  | 101
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100
Total Equity, end at Jun. 30, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Net income |  |  |  |  |  |  |  |  | 155 |  |  |  |  |  |  |  |  |  |  | 140
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139
Total Equity, end at Sep. 30, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 67 |  |  |  |  |  |  |  |  |  |  | 41
Net Income Attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41
Total Equity, end at Dec. 31, 2011 |  |  | $ (2) |  |  |  | $ 44 |  | $ 4,394 |  |  | $ (49) |  |  | $ (1) |  |  |  |  | $ 3,072

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