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Consolidated Statements Of Changes In Equity - USD ($) $ in Millions | Total | Common Stock | Other Paid-in Capital | Accumulated Other Comprehensive Loss | Retirement benefits liability | Retirement benefits liability Cumulative Effect, Period of Adoption, Adjustment | Derivative instruments | Retained Earnings (Accumulated Deficit) | Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment | 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 Retirement benefits liability Cumulative Effect, Period of Adoption, Adjustment | Consumers Energy Company Investments | Consumers Energy Company Investments Cumulative Effect, Period of Adoption, Adjustment | Consumers Energy Company Retained Earnings (Accumulated Deficit) | Consumers Energy Company Retained Earnings (Accumulated Deficit) Cumulative Effect, Period of Adoption, Adjustment | Consumers Energy Company Cumulative Preferred Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total Equity at Beginning of Period at Dec. 31, 2017 | $ 4,478 | $ 3 | $ 5,019 | $ (50) | $ (50) | $ (11) | $ 0 | $ (531) | $ 8 | $ 37 | $ 6,488 | $ 841 | $ 4,449 | $ (12) | $ (24) | $ (5) | $ 12 | $ (12) | $ 1,173 | $ 19 | $ 37
Beginning of period (in shares) at Dec. 31, 2017 |  | 281,647,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  | 1,554,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) |  | (224,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (10) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued (in shares) |  | 423,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired (in shares) |  | (26,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |
Net loss arising during the period | (4) |  |  |  | (4) |  |  |  |  |  | 6 |  |  |  | 6 |  |  |  |  |  |
Settlement arising during the period | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit adjustment | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | 4 |  |  |  | 4 |  |  |  |  |  | 2 |  |  |  | 2 |  |  |  |  |  |
Amortization of prior service credit | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  | (1) |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  | 1 |  |  |  |
Unrealized loss on derivative instruments | (2) |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income | 0 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 659 |  |  |  |  |  |  | 657 |  | 2 | 705 |  |  |  |  |  |  |  | 705 |  |
Dividends declared on common stock |  |  |  |  |  |  |  | (405) |  |  |  |  |  |  |  |  |  |  | (531) |  |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |
Impact of purchase and consolidation of VIE |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Sale of membership interest in VIE to tax equity investor |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Contribution from noncontrolling interest |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |
End of period (in shares) at Dec. 31, 2018 |  | 283,374,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity at End of Period at Dec. 31, 2018 | $ 4,792 | $ 3 | 5,088 | (65) | (63) | 0 | (2) | (271) | 0 | 37 | 6,920 | 841 | 4,699 | (21) | (21) | 0 | 0 | 0 | 1,364 | 0 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 1.43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  | 710,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) |  | (181,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (10) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued (in shares) |  | 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired (in shares) |  | (47,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  |  |  | 675 |  |  |  |  |  |  |  |
Net loss arising during the period | $ (7) |  |  |  | (7) |  |  |  |  |  | (8) |  |  |  | (8) |  |  |  |  |  |
Settlement arising during the period | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit adjustment | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | 3 |  |  |  | 3 |  |  |  |  |  | 1 |  |  |  | 1 |  |  |  |  |  |
Amortization of prior service credit | (2) |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |
Unrealized loss on derivative instruments | (3) |  |  |  |  |  | (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income | 1 |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 682 |  |  |  |  |  |  | 680 |  | 2 | $ 743 |  |  |  |  |  |  |  | 743 |  |
Dividends declared on common stock |  |  |  |  |  |  |  | (434) |  |  |  |  |  |  |  |  |  |  | (592) |  |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |
Impact of purchase and consolidation of VIE |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Sale of membership interest in VIE to tax equity investor |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Contribution from noncontrolling interest |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |
End of period (in shares) at Dec. 31, 2019 | 283,900,000 | 283,864,000 |  |  |  |  |  |  |  |  | 84,100,000 |  |  |  |  |  |  |  |  |  |
Total Equity at End of Period at Dec. 31, 2019 | $ 5,055 | $ 3 | 5,113 | (73) | (69) | $ 0 | (4) | (25) | $ (51) | 37 | $ 7,737 | 841 | 5,374 | (28) | (28) | $ 0 | 0 | $ 0 | 1,513 | $ 0 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 1.53 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  | 5,609,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 265 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) |  | (216,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (13) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued (in shares) |  | 12,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired (in shares) |  | (329,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  |  |  | 650 |  |  |  |  |  |  |  |
Net loss arising during the period | $ (15) |  |  |  | (15) |  |  |  |  |  | (9) |  |  |  | (9) |  |  |  |  |  |
Settlement arising during the period | 1 |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit adjustment | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss | 5 |  |  |  | 5 |  |  |  |  |  | 1 |  |  |  | 1 |  |  |  |  |  |
Amortization of prior service credit | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  |
Unrealized loss on derivative instruments | (4) |  |  |  |  |  | (4) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income | 2 |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 752 |  |  |  |  |  |  | 755 |  | (3) | $ 816 |  |  |  |  |  |  |  | 816 |  |
Dividends declared on common stock |  |  |  |  |  |  |  | (465) |  |  |  |  |  |  |  |  |  |  | (637) |  |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |
Impact of purchase and consolidation of VIE |  |  |  |  |  |  |  |  |  | 101 |  |  |  |  |  |  |  |  |  |  |
Sale of membership interest in VIE to tax equity investor |  |  |  |  |  |  |  |  |  | 417 |  |  |  |  |  |  |  |  |  |  |
Contribution from noncontrolling interest |  |  |  |  |  |  |  |  |  | 31 |  |  |  |  |  |  |  |  |  |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |
End of period (in shares) at Dec. 31, 2020 | 288,900,000 | 288,940,000 |  |  |  |  |  |  |  |  | 84,100,000 |  |  |  |  |  |  |  |  |  |
Total Equity at End of Period at Dec. 31, 2020 | $ 6,077 | $ 3 | $ 5,365 | $ (86) | $ (80) |  | $ (6) | $ 214 |  | $ 581 | $ 8,556 | $ 841 | $ 6,024 | $ (36) | $ (36) |  | $ 0 |  | $ 1,690 |  | $ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 1.63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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