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Financings (Major Long-Term Debt Transactions) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2011
Consumers Energy Company [Member] | Debt Issuances [Member] | April 2018 Tax-Exempt Bonds [Member] |  |
Debt Issuance, Principal | $ 68 | [1]
Debt Issuance Date | May 2011 | [1]
Maturity Date | Apr. 15, 2018 |
Consumers Energy Company [Member] | Debt Issuances [Member] | April 2035 Tax Exempt Bonds [Member] |  |
Debt Issuance, Principal | 35 | [1]
Debt Issuance Date | May 2011 | [1]
Maturity Date | Apr. 01, 2035 | [1]
Debt Issuances [Member] |  |
Debt Issuance, Principal | 353 |
Debt Issuances [Member] | Senior Notes [Member] |  |
Debt Issuance, Principal | 250 |
Interest Rate | 2.75% |
Debt Issuance Date | May 2011 |
Maturity Date | May 15, 2014 |
Consumers Energy Company [Member] | Debt Retirements [Member] |  |
Debt Retirement, Principal | 103 |
Consumers Energy Company [Member] | Debt Retirements [Member] | April 2018 Tax-Exempt Bonds [Member] |  |
Maturity Date | Apr. 01, 2018 | [1]
Debt Retirement, Principal | 68 | [1]
Debt Retirement Date | May 2011 | [1]
Consumers Energy Company [Member] | Debt Retirements [Member] | April 2035 Tax Exempt Bonds [Member] |  |
Maturity Date | Apr. 01, 2035 | [1]
Debt Retirement, Principal | $ 35 | [1]
Debt Retirement Date | May 2011 | [1]
Consumers Energy Company [Member] | April 2018 Tax-Exempt Bonds [Member] |  |
Interest Rate | 0.26% |
Consumers Energy Company [Member] | April 2035 Tax Exempt Bonds [Member] |  |
Interest Rate | 0.28% |
[1] | In May 2011, Consumers utilized the Michigan Strategic Fund for the issuance of $68 million and $35 million of tax-exempt Michigan Strategic Fund Variable Rate Limited Obligation Revenue Bonds. The initial interest rate, which resets weekly, was 0.26 percent for the $68 million bond issuance and 0.28 percent for the $35 million bond issuance. The bonds, which are backed by letters of credit and collateralized by FMBs, are subject to optional tender by the holders that would result in remarketing. Consumers used the proceeds to redeem $103 million of tax-exempt bonds in May 2011.

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: 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 Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). + 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 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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