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Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | $ 86 | $ 25
Net amounts recognized on the Condensed Consolidated Balance Sheet | 86 | 25
Current assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 60 | 24
Gross amounts offset | (1) | (1)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 59 | 23
Noncurrent assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 26 | 1
Gross amounts offset | (8) |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 18 | 1
Duke Energy Carolinas |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 38 |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 38 |
Duke Energy Carolinas | Current assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 24 |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 24 |
Duke Energy Carolinas | Noncurrent assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 14 |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 14 |
Progress Energy |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 33 | 7
Net amounts recognized on the Condensed Consolidated Balance Sheet | 33 | 7
Progress Energy | Current assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 21 | 7
Gross amounts offset |  | (1)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 21 | 6
Progress Energy | Noncurrent assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 12 |
Gross amounts offset | (8) |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 4 |
Duke Energy Progress |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 33 |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 33 |
Duke Energy Progress | Current assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 21 |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 21 |
Duke Energy Progress | Noncurrent assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 12 |
Gross amounts offset | (8) |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 4 |
Duke Energy Florida |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 7
Net amounts recognized on the Condensed Consolidated Balance Sheet |  | 7
Duke Energy Florida | Current assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 7
Gross amounts offset |  | (1)
Net amounts recognized on the Condensed Consolidated Balance Sheet |  | 6
Duke Energy Ohio |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 2 | 4
Duke Energy Ohio | Current assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 2 | 3
Net amounts recognized on the Condensed Consolidated Balance Sheet | 2 | 3
Duke Energy Ohio | Noncurrent assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 1
Net amounts recognized on the Condensed Consolidated Balance Sheet |  | 1
Duke Energy Indiana |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 8 | 13
Net amounts recognized on the Condensed Consolidated Balance Sheet | 8 | 13
Duke Energy Indiana | Current assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 8 | 13
Net amounts recognized on the Condensed Consolidated Balance Sheet | 8 | 13
Piedmont Natural Gas |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 6 | 1
Net amounts recognized on the Condensed Consolidated Balance Sheet | 6 | 1
Piedmont Natural Gas | Current assets |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 6 | 1
Net amounts recognized on the Condensed Consolidated Balance Sheet | $ 6 | $ 1

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