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Financings and Capitalization (Narrative) (Details) (USD $) | 12 Months Ended |  |  |  |  | 12 Months Ended | 31 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Consumers Energy Company [Member] | Dec. 31, 2012 Consumers Energy Company [Member] | Jul. 31, 2013 Consumers Energy Company [Member] $4.16 Series [Member] | Dec. 31, 2013 Short-Term Borrowings [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Continuous Equity Program [Member] | Dec. 31, 2013 Senior Notes 5.5% Due June 2029 [Member] | Dec. 31, 2013 Senior Notes 5.5% Due June 2029 [Member]
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |  |
Maximum allowed short term securities outstanding under FERC Authorization | $ 500,000,000 |  | $ 500,000,000 |  |  |  |  |  |
Short-term securites, remaining availability under FERC Authorization | 200,000,000 |  | 200,000,000 |  |  |  |  |  |
Maximum allowed long-term securites outstanding under FERC Authorization | 1,900,000,000 |  | 1,900,000,000 |  |  |  |  |  |
Long-term securities, remaining availability under FERC Authorization | 800,000,000 |  | 800,000,000 |  |  |  |  |  |
Amount of accounts receivable eligible for transfer |  |  |  |  |  | 250,000,000 |  |  |
Outstanding balance of revolving accounts receivable sales program |  |  |  |  |  | 170,000,000 |  |  |
Average short-term borrowings |  |  |  |  |  | 10,000,000 |  |  |
Weighted average annual interest rate |  |  |  |  |  | 0.90% |  |  |
Trigger price as a percentage of conversion price |  |  |  |  |  |  |  |  | 130.00%
Number of trading days, adjusted trigger price contingencies were met |  |  |  |  |  |  |  | 20 days | 20 days
Number of trading days |  |  |  |  |  |  |  | 30 days | 30 days
Principal converted |  |  |  |  |  |  |  | 17,000,000 |
Convertible debt, interest rate |  |  |  |  |  |  |  | 5.50% |
Debt conversion, Ratio denominator |  |  |  |  |  |  |  | 1,000 |
Debt Conversion, Converted Instrument, Amount per denominator amount |  |  |  |  |  |  |  | 1,968 |
Shares issued upon debt conversion |  |  |  |  |  |  |  | 605,531 |
Debt conversion, Cash paid upon settlement |  |  |  |  |  |  |  | 17,000,000 |
Limitation on payment of stock dividends | 3,500,000,000 |  |  |  |  |  |  |  |
Unrestricted retained earnings |  |  | 662,000,000 |  |  |  |  |  |
Common stock dividends from Consumers | 406,000,000 |  |  |  |  |  |  |  |
Common stock, shares authorized | 350,000,000 | 350,000,000 | 125,000,000 | 125,000,000 |  |  |  |  |
Par value of Common Stock | $ 0.01 |  |  |  |  |  |  |  |
Shares of Preferred Stock authorized | 10,000,000 |  | 7,500,000 | 7,500,000 |  |  |  |  |
Par value of Preferred Stock | $ 0.01 |  | $ 100 | $ 100 | $ 4.16 |  |  |  |
Aggregate sales price of an equity offering program |  |  |  |  |  |  | 50,000,000 |  |
Redemption price per share |  |  |  |  | $ 103.25 |  |  |  |
Redemption price |  |  |  |  | $ 7,000,000 |  |  |  |
Preferred shares outstanding |  |  |  |  | 68,451 |  |  |  |

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