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v3.19.3.a.u2

Severance (Narrative) (Details) - employee | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring and Related Activities [Abstract] |  |  |
Number of eligible employees | 140 | 1,900 | 100

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- Definition Number of eligible employees + References No definition available. + Details
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Namespace Prefix: | duk_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration