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Financings And Capitalization (Major Long-Term Debt Transactions) (Details) (USD $) | 6 Months Ended
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Jun. 30, 2013
Senior Notes 2.75% Due May 2014 [Member] | CMS Energy [Member] |  |
Debt issuance, principal | $ 250,000,000 |
Interest rate | 2.75% |
Maturity date | May 2014 |
Debt Issuance [Member] |  |
Debt issuance, principal | 675,000,000 |
Debt Issuance [Member] | CMS Energy [Member] |  |
Debt issuance, principal | 250,000,000 |
Debt Issuance [Member] | Consumers Energy Company [Member] |  |
Debt issuance, principal | 425,000,000 |
Debt Issuance [Member] | Senior Notes 4.70% Due March 2043 [Member] | CMS Energy [Member] |  |
Debt issuance, principal | 250,000,000 | [1]
Interest rate | 4.70% | [1]
Debt issuance date | March 2013 | [1]
Maturity date | March 2043 | [1]
Debt Issuance [Member] | First Mortgage Bonds 3.95% Due May 2043 [Member] | Consumers Energy Company [Member] |  |
Debt issuance, principal | 425,000,000 |
Interest rate | 3.95% |
Debt issuance date | May 2013 |
Maturity date | May 2043 |
Debt Retirements [Member] |  |
Debt issuance, principal | 425,000,000 |
Debt Retirements [Member] | Consumers Energy Company [Member] |  |
Debt issuance, principal | 425,000,000 |
Debt Retirements [Member] | First Mortgage Bonds 6% Due February 2014 [Member] | Consumers Energy Company [Member] |  |
Debt issuance, principal | 200,000,000 |
Interest rate | 6.00% |
Debt issuance date | June 2013 |
Maturity date | February 2014 |
Debt Retirements [Member] | First Mortgage Bonds 5% Due March 2015 [Member] | Consumers Energy Company [Member] |  |
Debt issuance, principal | $ 225,000,000 |
Interest rate | 5.00% |
Debt issuance date | June 2013 |
Maturity date | March 2015 |
[1] | CMS Energy plans to use these proceeds to retire all $250 million of CMS Energy’s 2.75 percent senior notes due May 2014.

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- Definition Maturity date of the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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