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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] | 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] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total Equity, beginning at Jun. 30, 2013 |  | $ 3,257 | $ (9) | $ (23) | $ 14 | $ 665 | $ 37 | $ 4,791 |  | $ 4,710 | $ (56) | $ (54) | $ (1) | $ (1) | $ (1,334) | $ 37 | $ 3,360
Common stock issued |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (9) |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain arising during the period |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  | 10
Prior service credit adjustment |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  | 5
Amortization of net actuarial loss |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  | 1
Unrealized gain (loss) on investments, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  | 1
Reclassification adjustments included in net income, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 126 |  |
Net income |  |  |  |  |  | 153 |  | 153 |  |  |  |  |  |  |  |  | 127
Common stock dividends declared |  |  |  |  |  | (106) |  |  |  |  |  |  |  |  | (68) |  |
Preferred stock dividends and distributions declared |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1
Distributions, redemptions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Preferred stock redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity, end at Sep. 30, 2013 | 841 | 3,257 | (9) | (23) | 14 | 711 | 37 | 4,837 | 3 | 4,708 | (39) | (38) |  | (1) | (1,276) | 37 | 3,433
Total Equity, beginning at Dec. 31, 2012 |  | 3,107 | (8) | (25) | 17 | 598 | 44 | 4,582 |  | 4,669 | (55) | (56) | 2 | (1) | (1,423) | 44 | 3,238
Common stock issued |  |  |  |  |  |  |  |  |  | 44 |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (10) |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
Stockholder contribution |  | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain arising during the period |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  | 10
Prior service credit adjustment |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  | 5
Amortization of net actuarial loss |  |  |  | 2 |  |  |  | 2 |  |  |  | 3 |  |  |  |  | 3
Unrealized gain (loss) on investments, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |  |  | (2)
Reclassification adjustments included in net income, net of tax |  |  |  |  | (3) |  |  | 3 |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350 |  |
Net income |  |  |  |  |  | 415 |  | 415 |  |  |  |  |  |  |  |  | 352
Common stock dividends declared |  |  |  |  |  | (300) |  |  |  |  |  |  |  |  | (203) |  |
Preferred stock dividends and distributions declared |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2
Distributions, redemptions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9) |
Preferred stock redeemed |  |  |  |  |  |  | (7) |  |  |  |  |  |  |  |  |  |
Total Equity, end at Sep. 30, 2013 | 841 | 3,257 | (9) | (23) | 14 | 711 | 37 | 4,837 | 3 | 4,708 | (39) | (38) |  | (1) | (1,276) | 37 | 3,433
Total Equity, beginning at Dec. 31, 2013 |  | 3,257 | (2) | (17) | 15 | 724 | 37 | 4,857 |  | 4,715 | (22) | (21) |  | (1) | (1,242) | 37 | 3,491
Common stock issued |  |  |  |  |  |  |  |  |  | 52 |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (7) |  |  |  |  |  |  |
Conversion option on convertible debt |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |
Stockholder contribution |  | 495 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return of stockholder contribution |  | (178) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  | 2 |  |  |  | 2 |  |  |  | 2 |  |  |  |  | 2
Amortization of prior service credit |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  | (1)
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 2 |  |  | 2 |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  | (1)
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 381 |  |
Net income |  |  |  |  |  | 449 |  | 449 |  |  |  |  |  |  |  |  | 382
Common stock dividends declared |  |  |  |  |  | (375) |  |  |  |  |  |  |  |  | (219) |  |
Preferred stock dividends and distributions declared |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1
Distributions, redemptions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Preferred stock redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity, end at Sep. 30, 2014 | 841 | 3,574 | 2 | (15) | 17 | 797 | 37 | 5,251 | 3 | 4,767 | (20) | (20) |  |  | (1,080) | 37 | 3,707
Total Equity, beginning at Jun. 30, 2014 |  | 3,572 | 2 | (16) | 18 | 798 | 37 | 5,250 |  | 4,761 | (20) | (20) |  |  | (1,099) | 37 | 3,682
Common stock issued |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |
Stockholder contribution |  | 180 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return of stockholder contribution |  | (178) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  |  | 1
Amortization of prior service credit |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  | (1)
Unrealized gain (loss) on investments, net of tax |  |  |  |  | (1) |  |  | (1) |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94 |  |
Net income |  |  |  |  |  | 119 |  | 119 |  |  |  |  |  |  |  |  | 94
Common stock dividends declared |  |  |  |  |  | (120) |  |  |  |  |  |  |  |  | (75) |  |
Distributions, redemptions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity, end at Sep. 30, 2014 | $ 841 | $ 3,574 | $ 2 | $ (15) | $ 17 | $ 797 | $ 37 | $ 5,251 | $ 3 | $ 4,767 | $ (20) | $ (20) |  |  | $ (1,080) | $ 37 | $ 3,707

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