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Leases (Operating Lease Right-of-use Assets and Liabilities) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jan. 01, 2019
--- | --- | ---
Lessee, Lease, Description [Line Items] |  |
ROU assets | $ 1,735 | $ 1,750
Operating lease liabilities – current | 213 | 205
Operating lease liabilities – noncurrent | 1,502 | 1,504
Duke Energy Carolinas [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 141 | 153
Operating lease liabilities – current | 27 | 28
Operating lease liabilities – noncurrent | 117 | 127
Progress Energy [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 839 | 863
Operating lease liabilities – current | 100 | 96
Operating lease liabilities – noncurrent | 747 | 766
Duke Energy Progress [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 407 | 407
Operating lease liabilities – current | 36 | 35
Operating lease liabilities – noncurrent | 377 | 371
Duke Energy Florida [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 432 | 456
Operating lease liabilities – current | 64 | 61
Operating lease liabilities – noncurrent | 370 | 395
Duke Energy Ohio [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 22 | 23
Operating lease liabilities – current | 1 | 1
Operating lease liabilities – noncurrent | 21 | 22
Duke Energy Indiana [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 60 | 61
Operating lease liabilities – current | 4 | 4
Operating lease liabilities – noncurrent | 56 | 58
Piedmont Natural Gas [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 26 | 26
Operating lease liabilities – current | 4 | 4
Operating lease liabilities – noncurrent | $ 25 | $ 25

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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, classified as current. + 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 Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + 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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