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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 |  |  |  |  |  |  |  |  |  | 39 |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (11) |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Stockholder contribution |  | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  | 2 |  |  |  | 2 |  |  |  | 2 |  |  |  | 2
Unrealized gain (loss) on investments, net of tax |  |  |  |  | (2) |  |  | (2) |  |  |  |  | (1) |  |  | (1)
Reclassification adjustments included in net income, net of tax |  |  |  |  | (5) |  |  | 5 |  |  |  |  |  |  |  |
Net income (loss) attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 269
Net income |  |  |  |  |  | 299 |  | 299 |  |  |  |  |  | 269 |  | 270
Dividends declared on common stock |  |  |  |  |  | (254) |  |  |  |  |  |  |  | (160) |  |
Dividends declared on preferred stock |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |
Income Attributable to Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1
Distributions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Total Equity, end at Jun. 30, 2015 | 841 | 3,724 | (12) | (24) | 12 | 876 | 37 | 5,466 | 3 | 4,812 | (48) | (46) | (2) | (949) | 37 | 3,855
Total Equity, beginning 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 |  |  |  |  |  |  |  |  |  | 29 |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1
Unrealized gain (loss) on investments, net of tax |  |  |  |  | (2) |  |  | (2) |  |  |  |  | (1) |  |  | (1)
Reclassification adjustments included in net income, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67
Net income |  |  |  |  |  | 84 |  | 84 |  |  |  |  |  | 67 |  | 68
Dividends declared on common stock |  |  |  |  |  | (132) |  |  |  |  |  |  |  | (80) |  |
Dividends declared on preferred stock |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |
Income Attributable to Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1
Distributions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
Total Equity, end at Jun. 30, 2015 | 841 | 3,724 | (12) | (24) | 12 | 876 | 37 | 5,466 | 3 | 4,812 | (48) | (46) | (2) | (949) | 37 | 3,855
Total Equity, beginning 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 Jun. 30, 2016 |  |  |  |  |  |  |  | 84,100,000 |  |  |  |  |  |  |  | 279,300,000
Total Equity, end at Jun. 30, 2016 | 841 | 3,999 | (1) | (19) | 18 | 1,040 | 37 | $ 5,916 | 3 | 4,906 | (47) | (43) | (4) | (706) | 37 | $ 4,193
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 |  |  |  |  |  |  |  |  |  | 79 |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (10) |  |  |  |  |  |
Stockholder contribution |  | 275 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  | $ 1
Amortization of prior service credit |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  | (1)
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 5 |  |  | $ 5 |  |  |  |  |  |  |  |
Reclassification adjustments included in net income, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 288
Net income |  |  |  |  |  | 304 |  | $ 304 |  |  |  |  |  | 288 |  | 289
Dividends declared on common stock |  |  |  |  |  | (213) |  |  |  |  |  |  |  | (172) |  |
Dividends declared on preferred stock |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |
Income Attributable to Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | $ 1
Distributions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
End of period, shares at Jun. 30, 2016 |  |  |  |  |  |  |  | 84,100,000 |  |  |  |  |  |  |  | 279,300,000
Total Equity, end at Jun. 30, 2016 | 841 | 3,999 | (1) | (19) | 18 | 1,040 | 37 | $ 5,916 | 3 | 4,906 | (47) | (43) | (4) | (706) | 37 | $ 4,193
Total Equity, beginning at Mar. 31, 2016 | 841 | 3,874 | (3) | (19) | 16 | 967 | 37 | 5,716 | 3 | 4,897 | (47) | (43) | (4) | (744) | 37 | 4,146
Common stock issued |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  | 125 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  | 1
Amortization of prior service credit |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  | (1)
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 2 |  |  | 2 |  |  |  |  |  |  |  |
Reclassification adjustments included in net income, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 124
Net income |  |  |  |  |  | 132 |  | $ 132 |  |  |  |  |  | 124 |  | 125
Dividends declared on common stock |  |  |  |  |  | (58) |  |  |  |  |  |  |  | (86) |  |
Dividends declared on preferred stock |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |
Income Attributable to Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | $ 1
Distributions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |
End of period, shares at Jun. 30, 2016 |  |  |  |  |  |  |  | 84,100,000 |  |  |  |  |  |  |  | 279,300,000
Total Equity, end at Jun. 30, 2016 | $ 841 | $ 3,999 | $ (1) | $ (19) | $ 18 | $ 1,040 | $ 37 | $ 5,916 | $ 3 | $ 4,906 | $ (47) | $ (43) | $ (4) | (706) | $ 37 | $ 4,193
Cumulative effect of change in accounting principle |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33 |  |

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