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Financings And Capitalization (Short-Term Borrowings) (Details) (Short-Term Borrowings [Member], Consumers Energy Company [Member], USD $)
In Millions, unless otherwise specified |
9 Months Ended |
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Sep. 30, 2012
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Short-Term Borrowings [Member] | Consumers Energy Company [Member]
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| Accounts receivable sales facility, maximum borrowing capacity | $ 250 |
| Accounts receivable sales facility, current borrowing capacity | 250 |
| Average short-term borrowings | $ 11 |
| Weighted average annual interest rate | 0.90% |