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v3.10.0.1

Severance (Narrative) (Details) - employee | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring and Related Activities [Abstract] |  |  |
Number of eligible employees | 1,900 | 100 | 600

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- Definition Number of eligible employees + References No definition available. + Details
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Namespace Prefix: | duk_
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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
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