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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Tax exempt bonds | $ (941,000,000) | $ (941,000,000)
Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 8,000,000,000 |
Commercial Paper | (3,022,000,000) |
Outstanding letters of credit | (53,000,000) |
Tax exempt bonds | (81,000,000) |
Coal ash set-aside | (500,000,000) |
Available capacity | 4,344,000,000 |
Parent Company [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 2,650,000,000 |
Commercial Paper | (917,000,000) |
Outstanding letters of credit | (45,000,000) |
Available capacity | 1,688,000,000 |
Duke Energy Carolinas [Member] |  |
Line of Credit Facility [Line Items] |  |
Tax exempt bonds | (243,000,000) | (243,000,000)
Duke Energy Carolinas [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 1,750,000,000 |
Commercial Paper | (739,000,000) |
Outstanding letters of credit | (4,000,000) |
Coal ash set-aside | (250,000,000) |
Available capacity | 757,000,000 |
Duke Energy Progress [Member] |  |
Line of Credit Facility [Line Items] |  |
Tax exempt bonds | (48,000,000) | (48,000,000)
Duke Energy Progress [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 1,400,000,000 |
Commercial Paper | (444,000,000) |
Outstanding letters of credit | (2,000,000) |
Coal ash set-aside | (250,000,000) |
Available capacity | 704,000,000 |
Duke Energy Florida [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 650,000,000 |
Commercial Paper | (108,000,000) |
Outstanding letters of credit | 0 |
Available capacity | 542,000,000 |
Duke Energy Ohio [Member] |  |
Line of Credit Facility [Line Items] |  |
Tax exempt bonds | (77,000,000) | (77,000,000)
Duke Energy Ohio [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 450,000,000 |
Commercial Paper | (299,000,000) |
Available capacity | 151,000,000 |
Duke Energy Indiana [Member] |  |
Line of Credit Facility [Line Items] |  |
Tax exempt bonds | (572,000,000) | $ (572,000,000)
Duke Energy Indiana [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 600,000,000 |
Commercial Paper | (317,000,000) |
Tax exempt bonds | (81,000,000) |
Available capacity | 202,000,000 |
Piedmont Natural Gas [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Facility Size | 500,000,000 |
Commercial Paper | (198,000,000) |
Outstanding letters of credit | (2,000,000) |
Available capacity | 300,000,000 |
Proceeds Loaned To Subsidiary Registrants [Member] | Parent Company [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Commercial Paper | $ (625,000,000) |

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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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