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Debt And Credit Facilities (Schedule Of Line Of Credit Facilities) (Details) (USD $)
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3 Months Ended | |||||
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Mar. 31, 2013
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| 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. | |||||
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Master Credit Facility [Member]
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| 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 | |||||
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Duke Energy Carolinas [Member] | Master Credit Facility [Member]
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| 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 | |||||
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Duke Energy Progress [Member]
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| 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) | |||||
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Duke Energy Florida [Member]
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| 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) | |||||
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Duke Energy Ohio [Member] | Master Credit Facility [Member]
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| 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 | |||||
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Duke Energy Ohio [Member] | Duke Energy Kentucky [Member] | Master Credit Facility [Member]
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| Line of Credit Facility [Line Items] | ||||||
| Facility Size | 100,000,000 | |||||
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Duke Energy Indiana [Member] | Master Credit Facility [Member]
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| 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 | |||||
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Parent Company [Member] | Master Credit Facility [Member]
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| 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 | |||||
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Parent Company [Member] | Proceeds Loaned To Subsidiary Registrants [Member]
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| Line of Credit Facility [Line Items] | ||||||
| Notes payable and commercial paper | $ 450,000,000 | |||||
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