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Commitments and Contingencies (Schedule of Legal Reserves) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Loss Contingencies [Line Items] |  |
Reserves for legal matters | $ 66 | $ 65
Duke Energy Carolinas [Member] |  |
Loss Contingencies [Line Items] |  |
Reserves for legal matters | 8 | 9
Progress Energy [Member] |  |
Loss Contingencies [Line Items] |  |
Reserves for legal matters | 57 | 54
Duke Energy Progress [Member] |  |
Loss Contingencies [Line Items] |  |
Reserves for legal matters | 15 | 12
Duke Energy Florida [Member] |  |
Loss Contingencies [Line Items] |  |
Reserves for legal matters | 24 | 24
Piedmont Natural Gas [Member] |  |
Loss Contingencies [Line Items] |  |
Reserves for legal matters | $ 1 | $ 1

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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