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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] | Retained Earnings (Accumulated Deficit) [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total Equity, beginning at Dec. 31, 2015 | $ 841 | $ 3,724 | $ (6) | $ (19) | $ 13 | $ 950 | $ 37 | $ 5,546 | $ 3 | $ 4,837 | $ (47) | $ (43) | $ (4) | $ (855) | $ 37 | $ 3,975
Common stock issued |  |  |  |  |  |  |  |  |  | 70 |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (10) |  |  |  |  |  |
Stockholder contribution |  | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on investments |  |  |  |  | 3 |  |  | 3 |  |  |  |  |  |  |  |
Reclassification adjustments included in net income, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 172 |  | 172 |  |  |  |  |  | 164 |  | 164
Dividends declared on common stock |  |  |  |  |  | (155) |  |  |  |  |  |  |  | (86) |  |
Total Equity, end at Mar. 31, 2016 | 841 | 3,874 | (3) | (19) | 16 | 967 | 37 | 5,716 | 3 | 4,897 | (47) | (43) | (4) | (744) | 37 | 4,146
Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  |
Total Equity, beginning at Dec. 31, 2016 | 841 | 3,999 | (3) | (21) | 18 | 1,065 | 37 | 5,939 | 3 | 4,916 | (50) | (50) |  | (616) | 37 | 4,290
Common stock issued |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (12) |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |
Stockholder contribution |  | 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on investments |  |  |  |  | 2 |  |  | 2 |  |  |  |  | 1 |  |  | 1
Reclassification adjustments included in net income, net of tax |  |  |  |  | (8) |  |  | (8) |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 211 |  | 211 |  |  |  |  |  | 199 |  | 199
Dividends declared on common stock |  |  |  |  |  | (148) |  |  |  |  |  |  |  | (94) |  |
Total Equity, end at Mar. 31, 2017 | $ 841 | $ 4,249 | $ (9) | $ (21) | $ 12 | $ 1,128 | $ 37 | $ 6,246 | $ 3 | $ 4,927 | $ (49) | $ (50) | $ 1 | $ (511) | $ 37 | $ 4,407

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