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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.

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