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Consolidated Statements of Changes In Equity (Unaudited) - USD ($) $ in Millions | Total | Common Stock | Other Paid-in Capital | Accumulated Other Comprehensive Loss | Retirement benefits liability | Investments | 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 Preferred Stock
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Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  | $ 0 | $ 0 | $ 0 |
Total Equity at Beginning of Period at Dec. 31, 2016 | $ 4,290 | $ 3 | $ 4,916 | $ (50) | (50) | $ 0 | (616) | $ 37 | $ 5,939 | $ 841 | $ 3,999 | $ (3) | (21) | 18 | 1,065 | $ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 95 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (13) |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  | 450 |  |  |  |  |
Amortization of net actuarial loss | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |
Amortization of prior service credit | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments | 2 |  |  |  |  | 2 |  |  | 2 |  |  |  |  | 2 |  |
Reclassification adjustments included in net income | 0 |  |  |  |  | 0 |  |  | (8) |  |  |  |  | (8) |  |
Net income | 464 |  |  |  |  |  | 463 | 1 | 496 |  |  |  |  |  | 496 |
Dividends declared on common stock |  |  |  |  |  |  | (281) |  |  |  |  |  |  |  | (347) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Total Equity at End of Period at Sep. 30, 2017 | 4,572 | 3 | 5,013 | (47) | (49) | 2 | (434) | 37 | 6,532 | 841 | 4,449 | (8) | (20) | 12 | 1,213 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | 0 |  | 0 |  |  |  |  |  | 0 | 0 | 0 |
Total Equity at Beginning of Period at Jun. 30, 2017 | 4,486 | 3 | 5,006 | (48) | (49) | 1 | (512) | 37 | 6,462 | 841 | 4,449 | (8) | (20) | 12 | 1,143 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Amortization of net actuarial loss | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |
Amortization of prior service credit | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments | 1 |  |  |  |  | 1 |  |  | 0 |  |  |  |  | 0 |  |
Reclassification adjustments included in net income | 0 |  |  |  |  | 0 |  |  | 0 |  |  |  |  | 0 |  |
Net income | 172 |  |  |  |  |  | 172 | 0 | 181 |  |  |  |  |  | 181 |
Dividends declared on common stock |  |  |  |  |  |  | (94) |  |  |  |  |  |  |  | (111) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Total Equity at End of Period at Sep. 30, 2017 | 4,572 | 3 | 5,013 | (47) | (49) | 2 | (434) | 37 | 6,532 | 841 | 4,449 | (8) | (20) | 12 | 1,213 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | (11) |  | 8 |  |  |  |  |  | (5) | (12) | 19 |
Total Equity at Beginning of Period at Dec. 31, 2017 | 4,478 | 3 | 5,019 | (50) | (50) | 0 | (531) | 37 | 6,488 | 841 | 4,449 | (12) | (24) | 12 | 1,173 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 54 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (10) |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  | 250 |  |  |  |  |
Amortization of net actuarial loss | 3 |  |  |  | 3 |  |  |  | 2 |  |  |  | 2 |  |  |
Amortization of prior service credit | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments | (1) |  |  |  |  | (1) |  |  | (1) |  |  |  |  | (1) |  |
Reclassification adjustments included in net income | 1 |  |  |  |  | 1 |  |  | 1 |  |  |  |  | 1 |  |
Net income | 550 |  |  |  |  |  | 549 | 1 | 574 |  |  |  |  |  | 574 |
Dividends declared on common stock |  |  |  |  |  |  | (304) |  |  |  |  |  |  |  | (392) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Total Equity at End of Period at Sep. 30, 2018 | 4,786 | 3 | 5,083 | (59) | (59) | 0 | (278) | 37 | 6,923 | 841 | 4,699 | (27) | (27) | 0 | 1,373 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | 0 |  | 0 |  |  |  |  |  | 0 | 0 | 0 |
Total Equity at Beginning of Period at Jun. 30, 2018 | 4,709 | 3 | 5,076 | (61) | (60) | (1) | (346) | 37 | 6,888 | 841 | 4,699 | (29) | (28) | (1) | 1,340 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Amortization of net actuarial loss | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |
Amortization of prior service credit | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments | 0 |  |  |  |  | 0 |  |  | 0 |  |  |  |  | 0 |  |
Reclassification adjustments included in net income | 1 |  |  |  |  | 1 |  |  | 1 |  |  |  |  | 1 |  |
Net income | 169 |  |  |  |  |  | 169 | 0 | 180 |  |  |  |  |  | 180 |
Dividends declared on common stock |  |  |  |  |  |  | (101) |  |  |  |  |  |  |  | (147) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Total Equity at End of Period at Sep. 30, 2018 | $ 4,786 | $ 3 | $ 5,083 | $ (59) | $ (59) | $ 0 | $ (278) | $ 37 | $ 6,923 | $ 841 | $ 4,699 | (27) | $ (27) | $ 0 | $ 1,373 | $ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |  |  |  |  | $ (19) |  |  |  |

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