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Financings and Capitalization (Preferred Stock of Subsidiary) (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Par value of Preferred Stock | $ 0.01 |
Shares of Preferred Stock authorized | 10,000,000 |
Consumers Energy Company [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Preferred stock Value | $ 37 | $ 37
Preferred Stock $4.50 Series [Member] | Consumers Energy Company [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Par value of Preferred Stock | $ 100 | $ 100
Shares of Preferred Stock authorized | 7,500,000 | 7,500,000
Optional Redemption Price | $ 110.00 | $ 110.00
Number of Shares | 373,148 | 373,148
Preferred stock Value | $ 37 | $ 37

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