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Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | $ 324 | $ 300
Net amounts presented on Balance Sheets | 324 | 277
Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 64 | 118
Gross amounts offset | (3) | (24)
Net amounts presented on Balance Sheets | 61 | 94
Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 260 | 182
Gross amounts offset | (5) |
Net amounts presented on Balance Sheets | 255 | 182
Duke Energy Carolinas |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 20 | 49
Net amounts presented on Balance Sheets | 20 | 49
Duke Energy Carolinas | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 17 | 39
Gross amounts offset | (2) |
Net amounts presented on Balance Sheets | 15 | 39
Duke Energy Carolinas | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 3 | 10
Gross amounts offset | (1) |
Net amounts presented on Balance Sheets | 2 | 10
Progress Energy |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 29 | 88
Net amounts presented on Balance Sheets | 29 | 65
Progress Energy | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 2 | 51
Gross amounts offset | (2) | (24)
Net amounts presented on Balance Sheets |  | 27
Progress Energy | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 27 | 37
Gross amounts offset | (4) |
Net amounts presented on Balance Sheets | 23 | 37
Duke Energy Progress |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 14 | 49
Net amounts presented on Balance Sheets | 14 | 49
Duke Energy Progress | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 2 | 27
Gross amounts offset | (2) |
Net amounts presented on Balance Sheets |  | 27
Duke Energy Progress | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 12 | 22
Gross amounts offset | (4) |
Net amounts presented on Balance Sheets | 8 | 22
Duke Energy Florida |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized |  | 24
Net amounts presented on Balance Sheets |  | 1
Duke Energy Florida | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 0 | 24
Gross amounts offset | 0 | (24)
Net amounts presented on Balance Sheets | 0 |
Duke Energy Florida | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 0 |
Gross amounts offset | 0 |
Net amounts presented on Balance Sheets | 0 |
Duke Energy Ohio |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 6 | 6
Duke Energy Ohio | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 1 | 1
Gross amounts offset | 0 |
Net amounts presented on Balance Sheets | 1 | 1
Duke Energy Ohio | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 5 | 5
Gross amounts offset | 0 |
Net amounts presented on Balance Sheets | 5 | 5
Duke Energy Indiana |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 1 | 1
Net amounts presented on Balance Sheets | 1 | 1
Duke Energy Indiana | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 1 | 1
Gross amounts offset | 0 |
Net amounts presented on Balance Sheets | 1 | 1
Duke Energy Indiana | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 0 |
Gross amounts offset | 0 |
Net amounts presented on Balance Sheets | 0 |
Piedmont |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 122 | 117
Net amounts presented on Balance Sheets | 122 | 117
Piedmont | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 15 | 7
Gross amounts offset | 0 |
Net amounts presented on Balance Sheets | 15 | 7
Piedmont | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 107 | 110
Gross amounts offset | 0 |
Net amounts presented on Balance Sheets | $ 107 | $ 110

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