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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 |  |  | 88 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (13) |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  | 450 |  |  |  |  |
Amortization of net actuarial loss | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |
Unrealized gain (loss) on investments | 1 |  |  |  |  | 1 |  |  | 2 |  |  |  |  | 2 |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  | (8) |  |  |  |  | (8) |  |
Amortization of prior service credit | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Net income | 292 |  |  |  |  |  | 291 | 1 | 315 |  |  |  |  |  | 315 |
Dividends declared on common stock |  |  |  |  |  |  | (187) |  |  |  |  |  |  |  | (236) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Total Equity at End 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | 0 |  | 0 |  |  |  |  |  | 0 | 0 | 0 |
Total Equity at Beginning of Period at Mar. 31, 2017 | 4,407 | 3 | 4,927 | (49) | (50) | 1 | (511) | 37 | 6,246 | 841 | 4,249 | (9) | (21) | 12 | 1,128 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 80 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  |
Amortization of net actuarial loss | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |
Unrealized gain (loss) on investments | 0 |  |  |  |  | 0 |  |  | 0 |  |  |  |  | 0 |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  |
Amortization of prior service credit | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Net income | 93 |  |  |  |  |  | 92 | 1 | 104 |  |  |  |  |  | 104 |
Dividends declared on common stock |  |  |  |  |  |  | (93) |  |  |  |  |  |  |  | (88) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Total Equity at End 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | 47 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | (10) |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  | 250 |  |  |  |  |
Amortization of net actuarial loss | 2 |  |  |  | 2 |  |  |  | 1 |  |  |  | 1 |  |  |
Unrealized gain (loss) on investments | (1) |  |  |  |  | (1) |  |  | (1) |  |  |  |  | (1) |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  |
Amortization of prior service credit | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Net income | 381 |  |  |  |  |  | 380 | 1 | 394 |  |  |  |  |  | 394 |
Dividends declared on common stock |  |  |  |  |  |  | (203) |  |  |  |  |  |  |  | (245) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Total Equity at End 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  | 0 |  | 0 |  |  |  |  |  | 0 | 0 | 0 |
Total Equity at Beginning of Period at Mar. 31, 2018 | 4,633 | 3 | 5,037 | (61) | (60) | (1) | (383) | 37 | 6,713 | 841 | 4,549 | (29) | (28) | (1) | 1,315 | 37
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 39 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  | 150 |  |  |  |  |
Amortization of net actuarial loss | 1 |  |  |  | 1 |  |  |  | 0 |  |  |  | 0 |  |  |
Unrealized gain (loss) on investments | 0 |  |  |  |  | 0 |  |  | 0 |  |  |  |  | 0 |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  |
Amortization of prior service credit | (1) |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Net income | 140 |  |  |  |  |  | 139 | 1 | 152 |  |  |  |  |  | 152 |
Dividends declared on common stock |  |  |  |  |  |  | (102) |  |  |  |  |  |  |  | (126) |
Dividends declared on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |
Total Equity at End 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |  |  |  |  | $ (19) |  |  |  |

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