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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, 2014 | $ 841 | $ 3,574 | $ (7) | $ (26) | $ 19 | $ 832 | $ 37 | $ 5,277 | $ 3 | $ 4,774 | $ (49) | $ (48) | $ (1) | $ (1,058) | $ 37 | $ 3,707
Common stock issued |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (11) |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Stockholder contribution |  | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1
Reclassification adjustments included in net income, net of tax |  |  |  |  | (5) |  |  | 5 |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 215 |  | 215 |  |  |  |  |  | 202 |  | 202
Dividends declared on common stock |  |  |  |  |  | (122) |  |  |  |  |  |  |  | (80) |  |
Total Equity, end at Mar. 31, 2015 | 841 | 3,724 | (11) | (25) | 14 | 925 | 37 | $ 5,516 | 3 | 4,783 | (48) | (47) | (1) | (936) | 37 | 3,839
Common stock issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90
Number of Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,337,781
End of period, shares at Mar. 31, 2016 |  |  |  |  |  |  |  | 84,100,000 |  |  |  |  |  |  |  | 279,200,000
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
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
Beginning of period, shares at Dec. 31, 2015 |  |  |  |  |  |  |  | 84,100,000 |  |  |  |  |  |  |  | 277,200,000
Common stock issued |  |  |  |  |  |  |  |  |  | 70 |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (10) |  |  |  |  |  |
Stockholder contribution |  | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on investments, net of tax |  |  |  |  | $ 3 |  |  | $ 3 |  |  |  |  |  |  |  |
Reclassification adjustments included in net income, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | 172 |  | $ 172 |  |  |  |  |  | 164 |  | $ 164
Dividends declared on common stock |  |  |  |  |  | (155) |  |  |  |  |  |  |  | (86) |  |
End of period, shares at Mar. 31, 2016 |  |  |  |  |  |  |  | 84,100,000 |  |  |  |  |  |  |  | 279,200,000
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 |  |

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