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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.