v2.4.0.8

Acquisitions and Dispositions (Narrative) (Details) (USD $)	9 Months Ended			12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014 Scenario Forecast [Member] Duke Energy Ohio [Member] Midwest Generation Business [Member]	Dec. 31, 2016 Scenario Forecast [Member] Duke Energy Progress [Member] NCEMPA Generating Assets [Member]
Significant Acquisitions and Disposals [Line Items]
Payments to acquire businesses	$ 16,000,000			$ 1,200,000,000
Disposal Group, Including Discontinued Operation, Consideration			$ 2,800,000,000

X

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SignificantAcquisitionsAndDisposalsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration