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Financings (Major Long-Term Debt Transactions) (Details) (USD $) |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 Debt Issuances [Member] | Mar. 31, 2012 Debt Retirements [Member] | Mar. 31, 2012 First Mortgage Bonds [Member] Consumers Energy Company [Member] | Dec. 31, 2011 Term Loan $180 Million [Member] | Mar. 31, 2012 Senior Notes 5.05% Due March 2022 [Member] Debt Issuances [Member] | Mar. 31, 2012 Term Loan Facility Due December 2016 [Member] Debt Issuances [Member] | Mar. 31, 2012 Senior Notes 2.875% Due December 2024 [Member] Debt Retirements [Member] | Jan. 31, 2012 Trust Preferred Securities [Member] | Mar. 31, 2012 Trust Preferred Securities [Member] Debt Retirements [Member]
Debt Issuance, Principal | $ 330,000,000 |  |  |  | $ 300,000,000 | $ 30,000,000 | [1],[2] |  |  |  |  |
Interest Rate |  |  | 5.00% |  | 5.05% |  |  | 2.875% | [3] | 7.75% | 7.75% | [4]
Debt Issuance Date |  |  |  |  | March 2012 | February 2012 | [1],[2] |  |  |  |  |
Maturity Date |  |  | February 2012 |  | March 2022 | December 2016 | [1],[2] | December 2024 | [3] |  | July 2027 | [4]
Debt Retirement, Principal |  | 402,000,000 | 300,000,000 |  |  |  |  | 73,000,000 | [3] |  | 29,000,000 | [4]
Debt Retirement Date |  |  | February 2012 |  |  |  |  | January 2012 | [3] |  | February 2012 | [4]
Term loan credit agreement |  |  |  | $ 180,000,000 |  |  |  |  |  |  |  |
LIBOR plus |  |  |  | 2.50% |  |  |  |  |  |  |  |
[1] | In December 2011, CMS Energy entered into a $180 million term loan credit agreement that provides for delayed draws through July 20, 2012. Outstanding borrowings will bear interest at an annual interest rate of LIBOR plus 2.5 percent.
[2] | CMS Energy used these proceeds to retire the 7.75 percent Trust Preferred Securities.
[3] | CMS Energy's contingently convertible notes. See the "Contingently Convertible Securities" section in this Note for further discussion of the conversions.
[4] | In January 2012, CMS Energy called all of its outstanding Trust Preferred Securities.

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