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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current notes receivable	$ 103	$ 98
Total notes receivable	968us-gaap_NotesReceivableNet	939us-gaap_NotesReceivableNet
EnerBank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current notes receivable	151	138
Noncurrent notes receivable	816	800
Receivables, Excluding Held For Sale [Member] \| EnerBank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current notes receivable	102	97
Receivables Held For Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current notes receivable	49	41
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current notes receivable	$ 1	$ 1

An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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