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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, 2012
Revolving Credit Facilities December 21, 2017 [Member] |  |
Expiration Date | Dec. 21, 2017 | [1]
Amount of Facility | $ 550 | [1]
Letters of Credit Outstanding | 2 | [1]
Amount Available | 548 | [1]
Average borrowings | 12 |
Weighted average interest rate | 2.26% |
LIBOR plus | 2.00% |
Revolving Credit Facilities December 21, 2017 [Member] | Consumers Energy Company [Member] |  |
Expiration Date | Dec. 21, 2017 | [2]
Amount of Facility | 500 | [2]
Letters of Credit Outstanding | 2 | [2]
Amount Available | 498 | [2]
Revolving Credit Facilities April 18, 2017 [Member] | Consumers Energy Company [Member] |  |
Expiration Date | Apr. 18, 2017 | [2]
Amount of Facility | 150 | [2]
Amount Available | 150 | [2]
Revolving Credit Facilities September 9, 2014 [Member] | Consumers Energy Company [Member] |  |
Expiration Date | Sep. 09, 2014 | [2]
Amount of Facility | 30 | [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, 2012 were $12 million, with a weighted-average annual interest rate of 2.26 percent, representing LIBOR plus 2.00 percent.
[2] | Obligations under this facility are secured by FMBs of Consumers.

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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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