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Leases (Operating Lease Right-of-use Assets and Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 01, 2019
--- | --- | ---
Lessee, Lease, Description [Line Items] |  |
ROU assets | $ 1,698 | $ 1,750
Operating lease liabilities – current | 183 | 205
Operating lease liabilities – noncurrent | 1,488 | 1,504
Duke Energy Carolinas [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 146 | 153
Operating lease liabilities – current | 26 | 28
Operating lease liabilities – noncurrent | 123 | 127
Progress Energy [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 835 | 863
Operating lease liabilities – current | 89 | 96
Operating lease liabilities – noncurrent | 748 | 766
Duke Energy Progress [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 388 | 407
Operating lease liabilities – current | 27 | 35
Operating lease liabilities – noncurrent | 361 | 371
Duke Energy Florida [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 447 | 456
Operating lease liabilities – current | 62 | 61
Operating lease liabilities – noncurrent | 387 | 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 | 61 | 61
Operating lease liabilities – current | 4 | 4
Operating lease liabilities – noncurrent | 57 | 58
Piedmont Natural Gas [Member] |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets | 27 | 26
Operating lease liabilities – current | 4 | 4
Operating lease liabilities – noncurrent | $ 26 | $ 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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