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Debt And Credit Facilities (Schedule Of Line Of Credit Facilities) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2013
Line of Credit Facility [Line Items] |  |
Line of credit facility, expiration date | Nov. 01, 2016 |
Extended facility size | $ 5,630,000,000 |
Line of credit facility, extended expiration date | Nov. 01, 2017 |
Line of credit facility, affiliated borrower | The Duke Energy Registrants each have borrowing capacity under the master credit facility up to specified sublimits for each borrower. However, Duke Energy has the unilateral ability at any time to increase or decrease the borrowing sublimits of each borrower, subject to a maximum sublimit for each borrower. |
Master Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 6,000,000,000 |
Outstanding letters of credit | (60,000,000) |
Notes payable and commercial paper | (1,306,000,000) |
Tax exempt bonds | (240,000,000) |
Available capacity | 4,394,000,000 |
Duke Energy Carolinas [Member] | Master Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 1,250,000,000 | [1]
Outstanding letters of credit | (7,000,000) |
Notes payable and commercial paper | (300,000,000) | [2]
Tax exempt bonds | (75,000,000) |
Available capacity | 868,000,000 |
Duke Energy Progress [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 750,000,000 | [1]
Outstanding letters of credit | (2,000,000) |
Notes payable and commercial paper | (26,000,000) |
Available capacity | (722,000,000) |
Duke Energy Florida [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 750,000,000 | [1]
Outstanding letters of credit | (1,000,000) |
Notes payable and commercial paper | (162,000,000) |
Available capacity | (587,000,000) |
Duke Energy Ohio [Member] | Master Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 750,000,000 | [1]
Outstanding letters of credit | 0 |
Notes payable and commercial paper | (163,000,000) |
Tax exempt bonds | (84,000,000) |
Available capacity | 503,000,000 |
Duke Energy Ohio [Member] | Duke Energy Kentucky [Member] | Master Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 100,000,000 |
Duke Energy Indiana [Member] | Master Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 750,000,000 | [1]
Outstanding letters of credit | 0 |
Notes payable and commercial paper | (169,000,000) | [2]
Tax exempt bonds | (81,000,000) |
Available capacity | 500,000,000 |
Parent Company [Member] | Master Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 1,750,000,000 | [1]
Outstanding letters of credit | (50,000,000) |
Notes payable and commercial paper | (486,000,000) | [2]
Available capacity | 1,214,000,000 |
Parent Company [Member] | Proceeds Loaned To Subsidiary Registrants [Member] |  |
Line of Credit Facility [Line Items] |  |
Notes payable and commercial paper | $ 450,000,000 |
[1] | Represents the sublimit of each borrower at March 31, 2013. The Duke Energy Ohio sublimit includes $100 million for Duke Energy Kentucky.
[2] | Duke Energy issued $450 million of commercial paper and loaned the proceeds through the money pool to Duke Energy Carolinas and Duke Energy Indiana. The balances are classified as long-term borrowings within Long-term Debt in Duke Energy Carolina’s and Duke Energy Indiana’s Condensed Consolidated Balance Sheets.

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- Definition Date the extended credit facility terminates, in CCYY-MM-DD format. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the extended credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
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Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Notes Payable And Commercial Paper + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as tax-exempt bonds. + References No definition available. + Details
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Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Period Type: | instant

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- Definition Identification of each affiliate who is permitted to utilize the line of credit (for example, a subsidiary of the reporting entity) and description of its relationship to the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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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- 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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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 3: 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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