XML 73 R41.htm IDEA: XBRL DOCUMENT v2.4.0.6
Financings And Capitalization (Short-Term Borrowings) (Details) (Short-Term Borrowings [Member], Consumers Energy Company [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Short-Term Borrowings [Member] | Consumers Energy Company [Member]
 
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%