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Summary of Significant Accounting Policies (Right of Use Assets and Operating Lease Liabilities) (Details) - Scenario, Forecast [Member] - Accounting Standards Update 2016-02 [Member] $ in Millions | Jan. 01, 2019 USD ($)
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Lessee, Lease, Description [Line Items] |
Operating lease liability | $ 1,700
Right of use assets | 1,700
Duke Energy Carolinas [Member] |
Lessee, Lease, Description [Line Items] |
Operating lease liability | 150
Right of use assets | 150
Progress Energy [Member] |
Lessee, Lease, Description [Line Items] |
Operating lease liability | 850
Right of use assets | 850
Duke Energy Progress [Member] |
Lessee, Lease, Description [Line Items] |
Operating lease liability | 400
Right of use assets | 400
Duke Energy Florida [Member] |
Lessee, Lease, Description [Line Items] |
Operating lease liability | 450
Right of use assets | 450
Duke Energy Ohio [Member] |
Lessee, Lease, Description [Line Items] |
Operating lease liability | 25
Right of use assets | 25
Duke Energy Indiana [Member] |
Lessee, Lease, Description [Line Items] |
Operating lease liability | 60
Right of use assets | 60
Piedmont Natural Gas [Member] |
Lessee, Lease, Description [Line Items] |
Operating lease liability | 30
Right of use assets | $ 30

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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