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Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Mcf in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) GWh Mcf | Dec. 31, 2018 USD ($) GWh Mcf
Commodity Contracts [Member] | Electricity [Member] |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 33,135 | 15,286
Commodity Contracts [Member] | Natural Gas [Member] |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of decatherms) | Mcf | 740 | 739
Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 2,386 | $ 2,644
Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | 959 | 923
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,427 | 1,721
Variable Interest Entity, Primary Beneficiary [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | 659 | 422
Variable Interest Entity, Primary Beneficiary [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 194 | $ 194
Duke Energy Carolinas [Member] | Commodity Contracts [Member] | Natural Gas [Member] |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of decatherms) | Mcf | 133 | 121
Duke Energy Carolinas [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 600 | $ 300
Duke Energy Carolinas [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 600 | $ 300
Progress Energy [Member] | Commodity Contracts [Member] | Natural Gas [Member] |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of decatherms) | Mcf | 173 | 169
Progress Energy [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 800 | $ 1,200
Progress Energy [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 800 | $ 1,200
Duke Energy Progress [Member] | Commodity Contracts [Member] | Natural Gas [Member] |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of decatherms) | Mcf | 173 | 166
Duke Energy Progress [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 250 | $ 650
Duke Energy Progress [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | 250 | $ 650
Duke Energy Florida [Member] | Commodity Contracts [Member] | Natural Gas [Member] |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of decatherms) | Mcf |  | 3
Duke Energy Florida [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | 550 | $ 550
Duke Energy Florida [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 550 | $ 550
Duke Energy Ohio [Member] | Commodity Contracts [Member] | Electricity [Member] |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 3,514 | 1,786
Duke Energy Ohio [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 27 | $ 27
Duke Energy Ohio [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 27 | $ 27
Duke Energy Indiana [Member] | Commodity Contracts [Member] | Electricity [Member] |  |
Derivative [Line Items] |  |
Notional amount, energy measure (in gigawatt-hours) | GWh | 29,621 | 13,500
Duke Energy Indiana [Member] | Commodity Contracts [Member] | Natural Gas [Member] |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of decatherms) | Mcf | 4 | 1
Piedmont Natural Gas [Member] | Commodity Contracts [Member] | Natural Gas [Member] |  |
Derivative [Line Items] |  |
Notional amount, volume (in millions of decatherms) | Mcf | 430 | 448

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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