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Financings and Capitalization (Preferred Stock of Subsidiary) (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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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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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
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