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Financings and Capitalization (Summary of Long-Term Debt Outstanding) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010
Principal Balance | $ 7,093,000,000 |  | $ 7,206,000,000 |
Current portion of long-term debt | (1,033,000,000) |  | (726,000,000) |
Net unamortized discount | (20,000,000) |  | (32,000,000) |
Total long-term debt | 6,040,000,000 |  | 6,448,000,000 |
Three-month LIBOR plus a spread, in basis points | 2.00% |  |  |
Consumers Energy Company [Member] |  |  |  |
Total Consumers principal amounts outstanding | 4,329,000,000 |  | 4,529,000,000 |
Current portion of long-term debt | (339,000,000) |  | (37,000,000) |
Net unamortized discount | (3,000,000) |  | (4,000,000) |
Total long-term debt | 3,987,000,000 |  | 4,488,000,000 |
Trust Preferred Securities [Member] |  |  |  |
Principal Balance | 29,000,000 |  |  |
Senior Notes 6.875% Due March 2018 [Member] |  |  |  |
Interest Rate | 6.875% |  |  |
Senior Notes 6.875% Due March 2018 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2018 |  |  |
Principal Balance | 180,000,000 |  | 180,000,000 |
Securitization Bonds [Member] |  |  |  |
Interest Rate | 5.652% | [1] |  |
Securitization Bonds [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date - Earliest | 2012 |  |  |
Maturity Date - Latest | 2015 |  |  |
Principal Balance | 171,000,000 | [1] | 208,000,000 | [1]
Weighted-average Interest Rate (%) | 5.652% |  | 5.613% |
Tax-Exempt Pollution Control Revenue Bonds [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date - Earliest | 2018 |  |  |
Maturity Date - Latest | 2035 |  |  |
Principal Balance | 103,000,000 |  | 103,000,000 |
Interest rate at period end |  |  | 0.132% |
Senior Notes [Member] |  |  |  |
Principal Balance | 2,273,000,000 |  | 2,285,000,000 |
Senior Notes [Member] | Senior Notes 8.5% Due April 2011 [Member] |  |  |  |
Interest Rate | 8.50% |  |  |
Maturity Date | 2011 |  |  |
Principal Balance |  |  | 146,000,000 |
Senior Notes [Member] | Senior Notes 6.3% Due February 2012 [Member] |  |  |  |
Interest Rate | 6.30% |  |  |
Maturity Date | 2012 |  |  |
Principal Balance |  |  | 50,000,000 |
Senior Notes [Member] | Senior Notes Variable Rate Due January 2013 [Member] |  |  |  |
Maturity Date | 2013 |  |  |
Principal Balance | 150,000,000 |  | 150,000,000 |
Bear interest at three-month LIBOR plus a spread, in basis points | three-month LIBOR |  |  |
Three-month LIBOR plus a spread, in basis points | 0.95% |  |  |
Interest rate at period end | 1.353% |  | 1.239% |
Senior Notes [Member] | Senior Notes 2.75% Due May 2014 [Member] |  |  |  |
Interest Rate | 2.75% |  |  |
Maturity Date | 2014 |  |  |
Principal Balance | 250,000,000 |  |  |
Senior Notes [Member] | Senior Notes 6.875% Due December 2015 [Member] |  |  |  |
Interest Rate | 6.875% |  |  |
Maturity Date | 2015 |  |  |
Principal Balance | 125,000,000 |  | 125,000,000 |
Senior Notes [Member] | Senior Notes 4.25% Due September 2015 [Member] |  |  |  |
Interest Rate | 4.25% |  |  |
Maturity Date | 2015 |  |  |
Principal Balance | 250,000,000 |  | 250,000,000 |
Senior Notes [Member] | Senior Notes 6.55% Due July 2017 [Member] |  |  |  |
Interest Rate | 6.55% |  |  |
Maturity Date | 2017 |  |  |
Principal Balance | 250,000,000 |  | 250,000,000 |
Senior Notes [Member] | Senior Notes 5.05% Due February 2018 [Member] |  |  |  |
Interest Rate | 5.05% |  |  |
Maturity Date | 2018 |  |  |
Principal Balance | 250,000,000 |  | 250,000,000 |
Senior Notes [Member] | Senior Notes 8.75% Due June 2019 [Member] |  |  |  |
Interest Rate | 8.75% |  |  |
Maturity Date | 2019 |  |  |
Principal Balance | 300,000,000 |  | 300,000,000 |
Senior Notes [Member] | Senior Notes 6.25% Due February 2020 [Member] |  |  |  |
Interest Rate | 6.25% |  |  |
Maturity Date | 2020 |  |  |
Principal Balance | 300,000,000 |  | 300,000,000 |
Senior Notes [Member] | Senior Notes 3.375% Due December 2023 [Member] |  |  |  |
Interest Rate | 3.375% | [2] |  |
Maturity Date | 2023 |  |  |
Principal Balance |  |  | 4,000,000 |
Senior Notes [Member] | Senior Notes 2.875% Due December 2024 [Member] |  |  |  |
Interest Rate | 2.875% | [2] |  |
Maturity Date | 2024 |  |  |
Principal Balance | 226,000,000 |  | 288,000,000 |
Senior Notes [Member] | Senior Notes 5.5% Due June 2029 [Member] |  |  |  |
Interest Rate | 5.50% | [2] |  |
Maturity Date | 2029 |  |  |
Principal Balance | 172,000,000 |  | 172,000,000 |
Other CMS Subsidiaries [Member] |  |  |  |
Principal Balance | 491,000,000 |  | 392,000,000 |
Other CMS Subsidiaries [Member] | Trust Preferred Securities [Member] |  |  |  |
Interest Rate | 7.75% |  |  |
Maturity Date | 2027 |  |  |
Principal Balance | 29,000,000 |  | 29,000,000 |
Other CMS Subsidiaries [Member] | EnerBank certificates of deposit [Member] |  |  |  |
Weighted-average interest rate | 1.328% | [3] | 1.707% |
Maturity Date - Earliest | 2012 |  |  |
Maturity Date - Latest | 2018 |  |  |
Interest-bearing Domestic Deposit, Brokered | 462,000,000 |  | 363,000,000 |
Certificate of deposit face value | 1,000 |  |  |
First Mortgage Bonds [Member] | Consumers Energy Company [Member] |  |  |  |
Total Consumers principal amounts outstanding | 3,875,000,000 |  | 3,875,000,000 |
Weighted-average Interest Rate (%) | 5.50% |  | 5.50% |
First Mortgage Bonds [Member] | FMBs 5 percent Due February 2012 [Member] |  |  |  |
Interest Rate | 5.00% | [4] |  |
First Mortgage Bonds [Member] | FMBs 5 percent Due February 2012 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2012 | [4] |  |
Principal Balance | 300,000,000 | [4] | 300,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 5.375 percent Due April 2013 [Member] |  |  |  |
Interest Rate | 5.375% | [4] |  |
First Mortgage Bonds [Member] | FMBs 5.375 percent Due April 2013 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2013 | [4] |  |
Principal Balance | 375,000,000 | [4] | 375,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 6 percent Due February 2014 [Member] |  |  |  |
Interest Rate | 6.00% | [4] |  |
First Mortgage Bonds [Member] | FMBs 6 percent Due February 2014 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2014 | [4] |  |
Principal Balance | 200,000,000 | [4] | 200,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 5 percent Due March 2015 [Member] |  |  |  |
Interest Rate | 5.00% | [4] |  |
First Mortgage Bonds [Member] | FMBs 5 percent Due March 2015 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2015 | [4] |  |
Principal Balance | 225,000,000 | [4] | 225,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 2.6 percent Due October 2015 [Member] |  |  |  |
Interest Rate | 2.60% | [4] |  |
First Mortgage Bonds [Member] | FMBs 2.6 percent Due October 2015 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2015 | [4] |  |
Principal Balance | 50,000,000 | [4] | 50,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 5.5 percent Due August 2016 [Member] |  |  |  |
Interest Rate | 5.50% | [4] |  |
First Mortgage Bonds [Member] | FMBs 5.5 percent Due August 2016 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2016 | [4] |  |
Principal Balance | 350,000,000 | [4] | 350,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 5.15 percent Due February 2017 [Member] |  |  |  |
Interest Rate | 5.15% | [4] |  |
First Mortgage Bonds [Member] | FMBs 5.15 percent Due February 2017 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2017 | [4] |  |
Principal Balance | 250,000,000 | [4] | 250,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 3.21 percent Due October 2017 [Member] |  |  |  |
Interest Rate | 3.21% | [4] |  |
First Mortgage Bonds [Member] | FMBs 3.21 percent Due October 2017 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2017 | [4] |  |
Principal Balance | 100,000,000 | [4] | 100,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 5.65 percent Due September 2018 [Member] |  |  |  |
Interest Rate | 5.65% | [4] |  |
First Mortgage Bonds [Member] | FMBs 5.65 percent Due September 2018 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2018 | [4] |  |
Principal Balance | 250,000,000 | [4] | 250,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 6.125 percent Due March 2019 [Member] |  |  |  |
Interest Rate | 6.125% | [4] |  |
First Mortgage Bonds [Member] | FMBs 6.125 percent Due March 2019 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2019 | [4] |  |
Principal Balance | 350,000,000 | [4] | 350,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 6.7 percent Due September 2019 [Member] |  |  |  |
Interest Rate | 6.70% | [4] |  |
First Mortgage Bonds [Member] | FMBs 6.7 percent Due September 2019 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2019 | [4] |  |
Principal Balance | 500,000,000 | [4] | 500,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 5.65 percent Due April 2020 [Member] |  |  |  |
Interest Rate | 5.65% | [4] |  |
First Mortgage Bonds [Member] | FMBs 5.65 percent Due April 2020 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2020 | [4] |  |
Principal Balance | 300,000,000 | [4] | 300,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 3.77 percent Due October 2020 [Member] |  |  |  |
Interest Rate | 3.77% | [4] |  |
First Mortgage Bonds [Member] | FMBs 3.77 percent Due October 2020 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2020 | [4] |  |
Principal Balance | 100,000,000 | [4] | 100,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 5.3 percent Due September 2022 [Member] |  |  |  |
Interest Rate | 5.30% | [4] |  |
First Mortgage Bonds [Member] | FMBs 5.3 percent Due September 2022 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2022 | [4] |  |
Principal Balance | 250,000,000 | [4] | 250,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 5.8 percent Due September 2035 [Member] |  |  |  |
Interest Rate | 5.80% | [4] |  |
First Mortgage Bonds [Member] | FMBs 5.8 percent Due September 2035 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2035 | [4] |  |
Principal Balance | 175,000,000 | [4] | 175,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 6.17 percent Due September 2040 [Member] |  |  |  |
Interest Rate | 6.17% | [4] |  |
First Mortgage Bonds [Member] | FMBs 6.17 percent Due September 2040 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2040 | [4] |  |
Principal Balance | 50,000,000 | [4] | 50,000,000 | [4]
First Mortgage Bonds [Member] | FMBs 4.97 percent Due October 2040 [Member] |  |  |  |
Interest Rate | 4.97% | [4] |  |
First Mortgage Bonds [Member] | FMBs 4.97 percent Due October 2040 [Member] | Consumers Energy Company [Member] |  |  |  |
Maturity Date | 2040 | [4] |  |
Principal Balance | 50,000,000 | [4] | 50,000,000 | [4]
Nuclear Fuel Disposal Liability [Member] |  |  |  |
Interest rate at period end |  |  | 0.132% | [4]
Nuclear Fuel Disposal Liability [Member] | Consumers Energy Company [Member] |  |  |  |
Principal Balance |  |  | $ 163,000,000 | [4]
[1] | The weighted-average interest rate for Consumers' Securitization bonds was 5.652 percent at December 31, 2011 and 5.613 percent at December 31, 2010.
[2] | CMS Energy's contingently convertible notes. See the "Contingently Convertible Securities" section in this Note for further discussion of the conversion features.
[3] | The weighted-average interest rate for EnerBank's certificates of deposit was 1.328 percent at December 31, 2011 and 1.707 percent at December 31, 2010. EnerBank's primary deposit product consists of brokered certificates of deposit with varying maturities. EnerBank sells these deposits through investment brokers in large pools, with each certificate within the pool having a face value of $1,000. They cannot be withdrawn until maturity, except in the case of death or incompetence of the holder.
[4] | The weighted-average interest rate for Consumers' FMBs was 5.5 percent at December 31, 2011 and 2010.

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- Definition Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the fair value of the face or notional amount of a contract right or obligation that meets the definition of an asset or liability reported in the financial statements of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 3 -Subparagraph a -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 815 -SubTopic 10 -Section 10 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6431724&loc=d3e32938-113948 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Underlying -URI http://asc.fasb.org/extlink&oid=6527499 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 10 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6438156&loc=d3e57880-113973 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument at that time. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

X
- Definition The weighted average interest rate for domestic brokered deposit liabilities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant