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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Revolving Credit Facility [Member] | Jun. 30, 2019 USD ($)
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Line of Credit Facility [Line Items] |
Facility size | $ 8,000,000,000
Commercial paper | (3,420,000,000)
Outstanding letters of credit | (53,000,000)
Tax exempt bonds | (81,000,000)
Coal ash set-aside | (500,000,000)
Available capacity | 3,946,000,000
Parent Company [Member] |
Line of Credit Facility [Line Items] |
Facility size | 2,650,000,000
Commercial paper | (1,009,000,000)
Outstanding letters of credit | (45,000,000)
Available capacity | 1,596,000,000
Duke Energy Carolinas [Member] |
Line of Credit Facility [Line Items] |
Facility size | 1,750,000,000
Commercial paper | (1,099,000,000)
Outstanding letters of credit | (4,000,000)
Coal ash set-aside | (250,000,000)
Available capacity | 397,000,000
Duke Energy Progress [Member] |
Line of Credit Facility [Line Items] |
Facility size | 1,250,000,000
Commercial paper | (276,000,000)
Outstanding letters of credit | (2,000,000)
Coal ash set-aside | (250,000,000)
Available capacity | 722,000,000
Duke Energy Florida [Member] |
Line of Credit Facility [Line Items] |
Facility size | 800,000,000
Commercial paper | (474,000,000)
Available capacity | 326,000,000
Duke Energy Ohio [Member] |
Line of Credit Facility [Line Items] |
Facility size | 450,000,000
Commercial paper | (236,000,000)
Available capacity | 214,000,000
Duke Energy Indiana [Member] |
Line of Credit Facility [Line Items] |
Facility size | 600,000,000
Commercial paper | (326,000,000)
Tax exempt bonds | (81,000,000)
Available capacity | 193,000,000
Piedmont Natural Gas [Member] |
Line of Credit Facility [Line Items] |
Facility size | 500,000,000
Outstanding letters of credit | (2,000,000)
Available capacity | 498,000,000
Proceeds Loaned To Subsidiary Registrants [Member] | Parent Company [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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