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Financings And Capitalization (Revolving Credit Facilities) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Revolving Credit Facilities December 20, 2018 [Member] |  |
Line of Credit Facility [Line Items] |  |
Expiration Date | Dec. 20, 2018 | [1]
Amount of Facility | $ 550 | [1]
Amount Borrowed |  | [1]
Letters of Credit Outstanding | 2 | [1]
Amount Available | 548 | [1]
Average borrowings | 4 |
Weighted average interest rate | 1.67% |
LIBOR plus | 1.50% |
Revolving Credit Facilities December 20, 2018 [Member] | Consumers Energy Company [Member] |  |
Line of Credit Facility [Line Items] |  |
Expiration Date | Dec. 20, 2018 | [2]
Amount of Facility | 650 | [2]
Amount Borrowed |  | [2]
Amount Available | 650 | [2]
Revolving Credit Facilities September 9, 2014 [Member] | Consumers Energy Company [Member] |  |
Line of Credit Facility [Line Items] |  |
Expiration Date | Sep. 09, 2014 | [2]
Amount of Facility | 30 | [2]
Amount Borrowed |  | [2]
Letters of Credit Outstanding | $ 30 | [2]
[1] | Obligations under this facility are secured by Consumers common stock. CMS Energy’s average borrowings during the year ended December 31, 2013 were $4 million, with a weighted-average annual interest rate of 1.67 percent, representing LIBOR plus 1.50 percent.
[2] | Obligations under this facility are secured by FMBs of Consumers.

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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