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Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross amounts recognized | $ 25 | $ 57
Net amounts presented on Balance Sheets | 25 | 57
Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 24 | 38
Gross amounts offset | (1) | (3)
Net amounts presented on Balance Sheets | 23 | 35
Noncurrent assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 1 | 19
Gross amounts offset |  | (3)
Net amounts presented on Balance Sheets | 1 | 16
Duke Energy Carolinas |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized |  | 3
Net amounts presented on Balance Sheets |  | 3
Duke Energy Carolinas | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized |  | 2
Gross amounts offset |  | (2)
Duke Energy Carolinas | Noncurrent assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized |  | 1
Gross amounts offset |  | (1)
Progress Energy |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 7 | 4
Net amounts presented on Balance Sheets | 7 | 4
Progress Energy | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 7 | 2
Gross amounts offset | (1) | (2)
Net amounts presented on Balance Sheets | 6 |
Progress Energy | Noncurrent assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized |  | 2
Gross amounts offset |  | (2)
Duke Energy Progress |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized |  | 4
Net amounts presented on Balance Sheets |  | 4
Duke Energy Progress | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized |  | 2
Gross amounts offset |  | (2)
Duke Energy Progress | Noncurrent assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized |  | 2
Gross amounts offset |  | (2)
Duke Energy Florida |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 7 |
Net amounts presented on Balance Sheets | 7 |
Duke Energy Florida | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 7 |
Gross amounts offset | (1) |
Net amounts presented on Balance Sheets | 6 |
Duke Energy Ohio |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 4 | 6
Duke Energy Ohio | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 3 | 6
Net amounts presented on Balance Sheets | 3 | 6
Duke Energy Ohio | Noncurrent assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 1 |
Net amounts presented on Balance Sheets | 1 |
Duke Energy Indiana |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 13 | 23
Net amounts presented on Balance Sheets | 13 | 23
Duke Energy Indiana | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 13 | 23
Net amounts presented on Balance Sheets | 13 | 23
Piedmont |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 1 | 3
Net amounts presented on Balance Sheets | 1 | 3
Piedmont | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 1 | 3
Net amounts presented on Balance Sheets | $ 1 | $ 3

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