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Financial Instruments (Schedule of Cost of Carrying Amounts and Fair Value of Long-Term Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Securities held to maturity, Cost or Carrying Amount $ 8 $ 7
Securities held to maturity - fair value 9 7
Securities available for sale, Cost or Carrying Amount 126 113
Securities available for sale, fair value 126 113
Long-term debt, Cost or Carrying Amount 7,007 [1] 7,073 [1]
Long-term Debt, Fair Value 7,972 [1] 8,025 [1]
Notes receivable 25 49
Current portion of long-term debt 814 1,033
Portion of long-term debt supported by third-party credit enhancements 103 103
Consumers Energy Company [Member]
    
Securities available for sale, Cost or Carrying Amount 90 81
Securities available for sale, fair value 114 109
Long-term debt, Cost or Carrying Amount 4,016 [2] 4,326 [2]
Long-term Debt, Fair Value 4,576 [2] 4,882 [2]
Notes receivable 0 23
Current portion of long-term debt 39 339
Portion of long-term debt supported by third-party credit enhancements 103 103
EnerBank USA [Member]
    
Total unsecured consumer installment loans, net of an allowance for loan losses 477 [3] 480 [3]
Notes receivable, Fair Value 504 [3] 504 [3]
Notes receivable 24 19
Fair Value, Inputs, Level 1 [Member]
    
Securities available for sale, fair value 126  
Fair Value, Inputs, Level 1 [Member] | Consumers Energy Company [Member]
    
Securities available for sale, fair value 114  
Long-term Debt, Fair Value    [2]  
Fair Value, Inputs, Level 2 [Member]
    
Securities held to maturity - fair value 9  
Long-term Debt, Fair Value 7,972 [1]  
Fair Value, Inputs, Level 2 [Member] | Consumers Energy Company [Member]
    
Securities available for sale, fair value     
Long-term Debt, Fair Value 4,576 [2]  
Fair Value, Inputs, Level 3 [Member] | Consumers Energy Company [Member]
    
Securities available for sale, fair value     
Long-term Debt, Fair Value    [2]  
Fair Value, Inputs, Level 3 [Member] | EnerBank USA [Member]
    
Notes receivable, Fair Value $ 504 [3]  
[1] Includes current portion of long-term debt of $814 million at March 31, 2012 and $1,033 million at December 31, 2011.
[2] Includes current portion of long-term debt of $39 million at March 31, 2012 and $339 million at December 31, 2011.
[3] Includes current portion of notes receivable of $24 million at March 31, 2012 and $19 million at December 31, 2011.