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Goodwill (Narrative) (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill | $ 19,303,000,000 | $ 19,303,000,000
Accumulated impairment charges | 122,000,000 | 122,000,000
Electric Utilities and Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 17,379,000,000 | 17,379,000,000
Gas Utilities and Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 1,924,000,000 | 1,924,000,000
Duke Energy Ohio [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 920,000,000 | 920,000,000
Accumulated impairment charges | 216,000,000 | 216,000,000
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 596,000,000 | 596,000,000
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 324,000,000 | 324,000,000
Progress Energy [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 3,655,000,000 | 3,655,000,000
Accumulated impairment charges | 0 | 0
Piedmont Natural Gas [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 49,000,000 | 49,000,000
Accumulated impairment charges | $ 0 | $ 0

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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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