v2.4.0.8

Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) (USD $) | 9 Months Ended
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Sep. 30, 2014
Variable Interest Entities [Line Items] |
Debt Instrument, Face Amount | $ 2,222,000,000
Duke Energy Progress [Member] |
Variable Interest Entities [Line Items] |
Debt Instrument, Face Amount | 650,000,000
Duke Energy Florida [Member] |
Variable Interest Entities [Line Items] |
Debt Instrument, Face Amount | 225,000,000
DERF [Member] | Duke Energy Carolinas [Member] | Variable Interest Entity, Primary Beneficiary [Member] |
Variable Interest Entities [Line Items] |
Debt Instrument, Face Amount | 400,000,000
Line of Credit Facility, Expiration Date | Oct. 01, 2016
DEPR [Member] | Duke Energy Progress [Member] | Variable Interest Entity, Primary Beneficiary [Member] |
Variable Interest Entities [Line Items] |
Debt Instrument, Face Amount | 300,000,000
Line of Credit Facility, Expiration Date | Dec. 01, 2016
DEFR [Member] | Duke Energy Florida [Member] | Variable Interest Entity, Primary Beneficiary [Member] |
Variable Interest Entities [Line Items] |
Debt Instrument, Face Amount | $ 225,000,000
Line of Credit Facility, Expiration Date | Mar. 01, 2017

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration