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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] | 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] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total Equity, beginning at Dec. 31, 2009 | $ 841 | $ 2,582 | $ 2 | $ (11) | $ 13 | $ 389 | $ 44 | $ 3,858 | $ 2 | $ 4,560 | $ (33) | $ (32) |  | $ (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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased, shares |  |  |  |  |  |  |  |  |  | (148,000) |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |
Common stock reacquired, shares |  |  |  |  |  |  |  |  |  | (205,000) |  |  |  |  |  |  |  |
Charge for deferred issuance costs |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  | (8) |  |  |
Stockholder contribution |  | 250 |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |  |
Net loss arising during the period |  |  |  | (5) |  |  |  | (5) |  |  |  | (9) |  |  |  |  |  | (9)
Amortization of net actuarial loss |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 1
Prior service credit adjustment |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 1
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on investments, net of tax |  |  |  |  | 3 |  |  | 3 |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 434 |  | 434 |  |  |  |  |  |  |  |  |  | 343
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 340 |  |  | 340
Common stock dividends declared |  |  |  |  |  | (358) |  |  |  |  |  |  |  |  | (154) |  |  |
Preferred stock dividends declared |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  | (8) |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (56) |
Conversion of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (239) |  |
Total Equity, end at Dec. 31, 2010 | 841 | 2,832 |  | (16) | 16 | 463 | 44 | 4,180 | 2 | 4,588 | (40) | (39) |  | (1) | (1,757) |  | 44 | 2,837
End of period, shares at Dec. 31, 2010 |  |  |  |  |  |  |  |  |  | 249,628,000 |  |  |  |  |  |  |  |
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 |  | (16) | 16 | 463 | 44 | 4,180 | 2 | 4,588 | (40) | (39) |  | (1) | (1,757) |  | 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 |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |
Common stock repurchased, shares |  |  |  |  |  |  |  |  |  | (323,000) |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (6) |  |  |  |  |  |  |  |
Common stock reacquired, shares |  |  |  |  |  |  |  |  |  | (15,000) |  |  |  |  |  |  |  |
Stockholder contribution |  | 125 |  |  |  |  |  | 125 |  |  |  |  |  |  |  |  |  |
Net loss arising during the period |  |  |  | (4) |  |  |  | (4) |  |  |  | (11) |  |  |  |  |  | (11)
Amortization of net actuarial loss |  |  |  | 1 |  |  |  | 1 |  |  |  | 2 |  |  |  |  |  | 2
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on investments, net of tax |  |  |  |  | 1 |  |  | 1 |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 467 |  | 467 |  |  |  |  |  |  |  |  |  | 417
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 415 |  |  | 415
Common stock dividends declared |  |  |  |  |  | (374) |  |  |  |  |  |  |  |  | (211) |  |  |
Preferred stock dividends declared |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |
Total Equity, end at Dec. 31, 2011 | 841 | 2,957 | (2) | (19) | 17 | 554 | 44 | 4,394 | 3 | 4,627 | (49) | (48) |  | (1) | (1,553) |  | 44 | 3,072
End of period, shares at Dec. 31, 2011 |  |  |  |  |  |  |  |  |  | 254,100,000 |  |  |  |  |  |  |  |
Total Equity, beginning at Sep. 30, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  | 67 |  |  |  |  |  |  |  |  |  | 41
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41
Total Equity, end at Dec. 31, 2011 | 841 |  | (2) |  |  |  | 44 | 4,394 |  |  | (49) |  |  | (1) |  |  |  | 3,072
Net income |  |  |  |  |  |  |  | 76 |  |  |  |  |  |  |  |  |  | 67
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67
Total Equity, end at Mar. 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity, beginning at Dec. 31, 2011 | 841 | 2,957 | (2) | (19) | 17 | 554 | 44 | 4,394 | 3 | 4,627 | (49) | (48) |  | (1) | (1,553) |  | 44 | 3,072
Beginning of period, shares at Dec. 31, 2011 |  |  |  |  |  |  |  |  |  | 254,100,000 |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  |  |  |  |  |  | 10,107,000 |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 45 |  |  |  |  |  |  |  |
Common stock reissued, shares |  |  |  |  |  |  |  |  |  | 272,000 |  |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |
Common stock repurchased, shares |  |  |  |  |  |  |  |  |  | (389,000) |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (9) |  |  |  |  |  |  |  |
Common stock reacquired, shares |  |  |  |  |  |  |  |  |  | (18,000) |  |  |  |  |  |  |  |
Stockholder contribution |  | 150 |  |  |  |  |  | 150 |  |  |  |  |  |  |  |  |  |
Net loss arising during the period |  |  |  | (8) |  |  |  | (8) |  |  |  | (10) |  |  |  |  |  | (10)
Amortization of net actuarial loss |  |  |  | 2 |  |  |  | 2 |  |  |  | 2 |  |  |  |  |  | 2
Reclassification adjustments included in net income |  |  |  |  | (3) |  |  | (3) |  |  |  |  |  |  |  |  |  |
Unrealized gain on investments, net of tax |  |  |  |  | 3 |  |  | 3 |  |  |  |  | 2 |  |  |  |  | 2
Net income |  |  |  |  |  | 439 |  | 439 |  |  |  |  |  |  |  |  |  | 384
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 382 |  |  | 382
Common stock dividends declared |  |  |  |  |  | (393) |  |  |  |  |  |  |  |  | (252) |  |  |
Preferred stock dividends declared |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |
Total Equity, end at Dec. 31, 2012 | 841 | 3,107 | (8) | (25) | 17 | 598 | 44 | 4,582 | 3 | 4,669 | (55) | (56) | 2 | (1) | (1,423) |  | 44 | 3,238
End of period, shares at Dec. 31, 2012 |  |  |  |  |  |  |  |  |  | 264,072,000 |  |  |  |  |  |  |  |
Total Equity, beginning at Sep. 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  | 78 |  |  |  |  |  |  |  |  |  | 67
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67
Total Equity, end at Dec. 31, 2012 | $ 841 |  | $ (8) |  |  |  | $ 44 | $ 4,582 |  |  | $ (55) |  |  | $ (1) |  |  |  | $ 3,238

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