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LPSC Fuel Audit (Details) (USD $) In Billions	Sep. 30, 2011
Louisiana Public Service Commission Fuel Audit [Abstract]
Fuel Expenses Included in Audit	$ 3.2

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- Definition

The approximate total amount of fuel expenses included in the Louisiana Public Service Commission audit of fuel adjustment clause filings.

+ Details

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Namespace Prefix:	cnl
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	cnl_LouisianaPublicServiceCommissionFuelAuditAbstract
Namespace Prefix:	cnl
Data Type:	xbrli:stringItemType
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Period Type:	duration