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Financial Instruments (Schedule of Cost of Carrying Amounts and Fair Value of Long-Term Financial Instruments) (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Securities held to maturity, Cost or Carrying Amount | $ 7 |  | $ 5 |
Securities held to maturity - fair value | 7 |  | 6 |
Securities available for sale, Cost or Carrying Amount | 115 |  | 90 |
Securities available for sale, fair value | 116 |  | 90 |
Total unsecured consumer installment loans, net of an allowance for loan losses | 398 | [1] | 386 | [1]
Notes receivable, Fair Value | 417 | [1] | 407 | [1]
Long-term debt, Cost or Carrying Amount | 7,283 | [2] | 7,174 | [2]
Long-term Debt, Fair Value | 8,074 | [2] | 7,861 | [2]
EnerBank's Loans classified as current Notes receivable | 57 |  | 70 |
Current portion of long-term debt | 1,099 |  | 726 |
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 | 82 |  | 64 |
Securities available for sale, fair value | 107 |  | 90 |
Long-term debt, Cost or Carrying Amount | 4,507 | [3] | 4,525 | [3]
Long-term Debt, Fair Value | 4,892 | [3] | 4,891 | [3]
EnerBank's Loans classified as current Notes receivable | 43 |  | 55 |
Current portion of long-term debt | 338 |  | 37 |
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 | 398 |  | 386 |
EnerBank's Loans classified as current Notes receivable | 13 |  | 11 |
Notes receivable | $ 13 |  | $ 11 |
[1] | Includes current portion of notes receivable of $13 million at June 30, 2011 and $11 million at December 31, 2010.
[2] | Includes current portion of long-term debt of $1,099 million at June 30, 2011 and $726 million at December 31, 2010.
[3] | Includes current portion of long-term debt of $338 million at June 30, 2011 and $37 million at December 31, 2010.

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