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Financings and Capitalization (Narrative) (Details) (USD $) |  | 6 Months Ended |  |  | 6 Months Ended | 23 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 CMS Energy [Member] | Jun. 30, 2013 Consumers Energy Company [Member] | May 31, 2013 Consumers Energy Company [Member] $4.16 Series [Member] | Jun. 30, 2013 Short-Term Borrowings [Member] Consumers Energy Company [Member] | Apr. 25, 2013 Continuous Equity Program [Member] | Jun. 30, 2013 Senior Notes 5.5% Due June 2029 [Member]
Financing And Capitalization [Line Items] |  |  |  |  |  |  |
Amount of Facility |  |  |  |  | $ 250,000,000 |  |
Accounts receivable sales facility, current borrowing capacity |  |  |  |  | 250,000,000 |  |
Average short-term borrowings |  |  |  |  | 10,000,000 |  |
Weighted average annual interest rate |  |  |  |  | 0.94% |  |
Number of trading days, adjusted trigger price contingencies were met |  |  |  |  |  |  | 20 days
Number of trading days |  |  |  |  |  |  | 30 days
Limitation on payment of stock dividends | 3,300,000,000 |  |  |  |  |  |
Unrestricted retained earnings |  |  | 603,000,000 |  |  |  |
Common stock dividends from Consumers |  | 194,000,000 |  |  |  |  |
Aggregate sales price of an equity offering program |  |  |  |  |  | 50,000,000 |
Preferred stock, par value |  |  |  | $ 4.16 |  |  |
Redemption price per share |  |  |  | $ 103.25 |  |  |
Redemption price |  |  |  | $ 7,000,000 |  |  |
Preferred shares outstanding |  |  |  | 68,451 |  |  |

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