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Consolidated Statements Of Changes In Equity - USD ($) shares in Thousands, $ in Millions | Total | Common Stock | Other Paid-in Capital | Accumulated Other Comprehensive Loss | Retirement benefits liability | Investments | Derivative instruments | Accumulated Deficit | Noncontrolling Interests | Consumers Energy Company | Consumers Energy Company Common Stock | Consumers Energy Company Other Paid-in Capital | Consumers Energy Company Accumulated Other Comprehensive Loss | Consumers Energy Company Retirement benefits liability | Consumers Energy Company Investments | Consumers Energy Company Accumulated Deficit | Consumers Energy Company Cumulative Preferred Stock
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Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | $ 0 |  |  | $ 33 |  |  |  |  |  | $ 0 | $ 0 | $ 0 |
Total Equity at Beginning of Period at Dec. 31, 2015 | $ 3,975 | $ 3 | $ 4,837 | $ (47) | (43) | $ (4) | $ 0 | (855) | $ 37 | $ 5,546 | $ 841 | $ 3,724 | $ (6) | (19) | 13 | 950 | $ 37
Beginning of period (in shares) at Dec. 31, 2015 |  | 277,163 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  | 2,580 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 90 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) |  | (292) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (11) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued (in shares) |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired (in shares) |  | (245) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  |  | 275 |  |  |  |  |
Net income attributable to CMS Energy | 551 |  |  |  |  |  |  | 551 |  |  |  |  |  |  |  |  |
Net loss arising during the period | (8) |  |  |  | (8) |  |  |  |  | (3) |  |  |  | (3) |  |  |
Prior service credit adjustment | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | 2 |  |  |  | 2 |  |  |  |  | 1 |  |  |  | 1 |  |  |
Amortization of prior service credit | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  |
Unrealized gain on investments | 1 |  |  |  |  | 1 |  |  |  | 3 |  |  |  |  | 3 |  |
Other-than-temporary impairment included in net income | 3 |  |  |  |  | 3 |  |  |  | 2 |  |  |  |  | 2 |  |
Unrealized loss on derivative instruments | 0 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Net Income | 553 |  |  |  |  |  |  |  |  | 616 |  |  |  |  |  | 616 |
Dividends declared on common stock |  |  |  |  |  |  |  | (345) |  |  |  |  |  |  |  | (499) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |
Income attributable to noncontrolling interests | $ 2 |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 1.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of period (in shares) at Dec. 31, 2016 |  | 279,206 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity at End of Period at Dec. 31, 2016 | $ 4,290 | $ 3 | 4,916 | (50) | (50) | 0 | 0 | (616) | 37 | 5,939 | 841 | 3,999 | (3) | (21) | 18 | 1,065 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  | 0 | 0 | 0 |
Common stock issued (in shares) |  | 2,492 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 102 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) |  | (317) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (14) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued (in shares) |  | 360 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired (in shares) |  | (94) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  |  | 450 |  |  |  |  |
Net income attributable to CMS Energy | 460 |  |  |  |  |  |  | 460 |  |  |  |  |  |  |  |  |
Net loss arising during the period | (5) |  |  |  | (5) |  |  |  |  | (4) |  |  |  | (4) |  |  |
Prior service credit adjustment | 4 |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | 2 |  |  |  | 2 |  |  |  |  | 1 |  |  |  | 1 |  |  |
Amortization of prior service credit | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  | (9) |  |  |  |  | (9) |  |
Unrealized gain on investments | 0 |  |  |  |  | 0 |  |  |  | 3 |  |  |  |  | 3 |  |
Other-than-temporary impairment included in net income | 0 |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  | 0 |  |
Unrealized loss on derivative instruments | 0 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Net Income | 462 |  |  |  |  |  |  |  |  | $ 632 |  |  |  |  |  | 632 |
Dividends declared on common stock |  |  |  |  |  |  |  | (375) |  |  |  |  |  |  |  | (522) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |
Income attributable to noncontrolling interests | $ 2 |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 1.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of period (in shares) at Dec. 31, 2017 | 281,600 | 281,647 |  |  |  |  |  |  |  | 84,100 |  |  |  |  |  |  |
Total Equity at End of Period at Dec. 31, 2017 | $ 4,478 | $ 3 | 5,019 | (50) | (50) | 0 | 0 | (531) | 37 | $ 6,488 | 841 | 4,449 | (12) | (24) | 12 | 1,173 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | (11) |  |  | 8 |  |  |  |  | (19) | (5) | (12) | 19 |
Common stock issued (in shares) |  | 1,554 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 59 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) |  | (224) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (10) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued (in shares) |  | 423 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired (in shares) |  | (26) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  |  | 250 |  |  |  |  |
Net income attributable to CMS Energy | 657 |  |  |  |  |  |  | 657 |  |  |  |  |  |  |  |  |
Net loss arising during the period | (4) |  |  |  | (4) |  |  |  |  | 6 |  |  |  | 6 |  |  |
Prior service credit adjustment | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | 4 |  |  |  | 4 |  |  |  |  | 2 |  |  |  | 2 |  |  |
Amortization of prior service credit | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  | 1 |  |
Unrealized gain on investments | 0 |  |  |  |  | 0 |  |  |  | (1) |  |  |  |  | (1) |  |
Other-than-temporary impairment included in net income | 0 |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  | 0 |  |
Unrealized loss on derivative instruments | (2) |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |
Net Income | 659 |  |  |  |  |  |  |  |  | $ 705 |  |  |  |  |  | 705 |
Dividends declared on common stock |  |  |  |  |  |  |  | (405) |  |  |  |  |  |  |  | (531) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |
Income attributable to noncontrolling interests | $ 2 |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 1.43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
End of period (in shares) at Dec. 31, 2018 | 283,400 | 283,374 |  |  |  |  |  |  |  | 84,100 |  |  |  |  |  |  |
Total Equity at End of Period at Dec. 31, 2018 | $ 4,792 | $ 3 | $ 5,088 | $ (65) | $ (63) | $ 0 | $ (2) | $ (271) | $ 37 | $ 6,920 | $ 841 | $ 4,699 | $ (21) | $ (21) | $ 0 | $ 1,364 | $ 37

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