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Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | $ 472 | $ 324
Net amounts presented on Balance Sheets | 472 | 324
Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 184 | 64
Gross amounts offset | (11) | (3)
Net amounts presented on Balance Sheets | 173 | 61
Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 288 | 260
Gross amounts offset | (12) | (5)
Net amounts presented on Balance Sheets | 276 | 255
Duke Energy Carolinas |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 35 | 20
Net amounts presented on Balance Sheets | 35 | 20
Duke Energy Carolinas | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 26 | 17
Gross amounts offset | (6) | (2)
Net amounts presented on Balance Sheets | 20 | 15
Duke Energy Carolinas | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 9 | 3
Gross amounts offset | (8) | (1)
Net amounts presented on Balance Sheets | 1 | 2
Progress Energy |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 24 | 29
Net amounts presented on Balance Sheets | 24 | 29
Progress Energy | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 19 | 2
Gross amounts offset | (5) | (2)
Net amounts presented on Balance Sheets | 14 |
Progress Energy | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 5 | 27
Gross amounts offset | (5) | (4)
Net amounts presented on Balance Sheets |  | 23
Duke Energy Progress |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 10 | 14
Net amounts presented on Balance Sheets | 10 | 14
Duke Energy Progress | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 5 | 2
Gross amounts offset | (5) | (2)
Duke Energy Progress | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 5 | 12
Gross amounts offset | (5) | (4)
Net amounts presented on Balance Sheets |  | 8
Duke Energy Florida |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 14 |
Net amounts presented on Balance Sheets | 14 |
Duke Energy Florida | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 14 |
Net amounts presented on Balance Sheets | 14 |
Duke Energy Ohio |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 5 | 6
Duke Energy Ohio | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 1 | 1
Net amounts presented on Balance Sheets | 1 | 1
Duke Energy Ohio | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 4 | 5
Net amounts presented on Balance Sheets | 4 | 5
Duke Energy Indiana |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 27 | 1
Net amounts presented on Balance Sheets | 27 | 1
Duke Energy Indiana | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 13 | 1
Net amounts presented on Balance Sheets | 13 | 1
Duke Energy Indiana | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 14 |
Net amounts presented on Balance Sheets | 14 |
Piedmont |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 139 | 122
Net amounts presented on Balance Sheets | 139 | 122
Piedmont | Current Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 21 | 15
Net amounts presented on Balance Sheets | 21 | 15
Piedmont | Noncurrent Liabilities |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 118 | 107
Net amounts presented on Balance Sheets | $ 118 | $ 107

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