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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] | Derivative Instruments [Member] | Retained Earnings (Accumulated Deficit) [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total Equity, beginning at Dec. 31, 2012 | $ 841 | $ 3,107 | $ (8) | $ (25) | $ 17 | $ 598 | $ 44 | $ 4,582 | $ 3 | $ 4,669 | $ (55) | $ (56) | $ 2 | $ (1) | $ (1,423) | $ 44 | $ 3,238
Common stock issued |  |  |  |  |  |  |  |  |  | 29 |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
Stockholder contribution |  | 150 |  |  |  |  |  | 150 |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  |  | 1
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 4 |  |  | 4 |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income, net of tax |  |  |  |  | (3) |  |  | 3 |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 144 |  |
Net income |  |  |  |  |  | 162 |  | 162 |  |  |  |  |  |  |  |  | 144
Common stock dividends declared |  |  |  |  |  | (93) |  |  |  |  |  |  |  |  | (67) |  |
Total Equity, end at Mar. 31, 2013 | 841 | 3,257 | (6) | (24) | 18 | 667 | 44 | 4,803 | 3 | 4,703 | (54) | (55) | 2 | (1) | (1,346) | 44 | 3,350
Total Equity, beginning at Dec. 31, 2013 | 841 | 3,257 | (2) | (17) | 15 | 724 | 37 | 4,857 | 3 | 4,715 | (22) | (21) |  | (1) | (1,242) | 37 | 3,491
Common stock issued |  |  |  |  |  |  |  |  |  | 37 |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (6) |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholder contribution |  | 150 |  |  |  |  |  | 150 |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 2 |  |  | 2 |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 1
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 204 |  |
Net income |  |  |  |  |  | 221 |  | 221 |  |  |  |  |  |  |  |  | 204
Common stock dividends declared |  |  |  |  |  | (135) |  |  |  |  |  |  |  |  | (72) |  |
Total Equity, end at Mar. 31, 2014 | $ 841 | $ 3,407 |  | $ (17) | $ 17 | $ 810 | $ 37 | $ 5,095 | $ 3 | $ 4,746 | $ (21) | $ (21) |  |  | $ (1,110) | $ 37 | $ 3,655

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