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Financings (Revolving Credit Facilities) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  | 3 Months Ended
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Sep. 30, 2011 | Sep. 30, 2011 Consumers Energy Company [Member] Revolving Credit Facilities March 31, 2016 [Member] | Sep. 30, 2011 Revolving Credit Facilities March 31, 2016 [Member] | Sep. 30, 2011 Consumers Energy Company [Member] Revolving Credit Facilities August 9, 2013 [Member] | Sep. 30, 2011 Consumers Energy Company [Member] Revolving Credit Facilities September 21, 2011 [Member] | Mar. 31, 2011 Consumers Energy Company [Member]
Amount of Facility |  | $ 500 | [1],[2] | $ 550 | [3] | $ 150 | [2] | $ 30 | [2],[4] |
Amount Borrowed |  |  | [1],[2] |  | [3] |  | [2] |  | [2],[4] |
Letters of Credit Outstanding |  | 1 | [1],[2] | 3 | [3] |  |  | 30 | [2],[4] |
Amount Available |  | 499 | [1],[2] | 547 | [3] | 150 | [2] |  |  |
Line of Credit Facility, Initiation Date |  |  |  |  |  |  |  |  |  | March 31, 2011
Average borrowings | $ 14 |  |  |  |  |  |  |  |  |
Weighted average interest rate | 2.22% |  |  |  |  |  |  |  |  |
[1] | 2 On March 31, 2011, Consumers entered into a $500 million secured revolving credit facility with a consortium of banks. This facility has a five-year term and replaces Consumers' revolving credit facility that was set to expire in 2012.
[2] | 3 Obligations under this facility are secured by FMBs of Consumers.
[3] | 1 On March 31, 2011, CMS Energy entered into a $550 million secured revolving credit facility with a consortium of banks. This facility has a five-year term and replaces CMS Energy's revolving credit facility that was set to expire in 2012. Obligations under this facility are secured by Consumers common stock. CMS Energy's average borrowings during the nine months ended September 30, 2011 totaled $14 million, with a weighted-average annual interest rate of 2.22 percent, representing LIBOR plus 2.00 percent
[4] | 4 Secured revolving letter of credit facility.

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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 Reflects when the credit facility first became available, which may be presented in a variety of ways (year, month and year, day, month and year, quarter). + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: 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 + Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: 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 + Details
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