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Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | $ 359 | $ 300
Net amounts recognized on the Condensed Consolidated Balance Sheet | 359 | 277
Current liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 84 | 118
Gross amounts offset | (1) | (24)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 83 | 94
Noncurrent liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 275 | 182
Gross amounts offset | (8) |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 267 | 182
Duke Energy Carolinas |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 33 | 49
Net amounts recognized on the Condensed Consolidated Balance Sheet | 33 | 49
Duke Energy Carolinas | Current liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 29 | 39
Net amounts recognized on the Condensed Consolidated Balance Sheet | 29 | 39
Duke Energy Carolinas | Noncurrent liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 4 | 10
Net amounts recognized on the Condensed Consolidated Balance Sheet | 4 | 10
Progress Energy |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 36 | 88
Net amounts recognized on the Condensed Consolidated Balance Sheet | 36 | 65
Progress Energy | Current liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 9 | 51
Gross amounts offset |  | (24)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 9 | 27
Progress Energy | Noncurrent liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 27 | 37
Gross amounts offset | (8) |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 19 | 37
Duke Energy Progress |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 20 | 49
Net amounts recognized on the Condensed Consolidated Balance Sheet | 20 | 49
Duke Energy Progress | Current liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 9 | 27
Net amounts recognized on the Condensed Consolidated Balance Sheet | 9 | 27
Duke Energy Progress | Noncurrent liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 11 | 22
Gross amounts offset | (8) |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 3 | 22
Duke Energy Florida |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized |  | 24
Net amounts recognized on the Condensed Consolidated Balance Sheet |  | 1
Duke Energy Florida | Current liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized |  | 24
Gross amounts offset |  | (24)
Duke Energy Ohio |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 7 | 6
Duke Energy Ohio | Current liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 2 | 1
Net amounts recognized on the Condensed Consolidated Balance Sheet | 2 | 1
Duke Energy Ohio | Noncurrent liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 5 | 5
Net amounts recognized on the Condensed Consolidated Balance Sheet | 5 | 5
Duke Energy Indiana |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized |  | 1
Net amounts recognized on the Condensed Consolidated Balance Sheet |  | 1
Duke Energy Indiana | Current liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized |  | 1
Net amounts recognized on the Condensed Consolidated Balance Sheet |  | 1
Piedmont Natural Gas |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 111 | 117
Net amounts recognized on the Condensed Consolidated Balance Sheet | 111 | 117
Piedmont Natural Gas | Current liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 13 | 7
Net amounts recognized on the Condensed Consolidated Balance Sheet | 13 | 7
Piedmont Natural Gas | Noncurrent liabilities |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 98 | 110
Net amounts recognized on the Condensed Consolidated Balance Sheet | $ 98 | $ 110

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