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Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross amounts recognized | $ 320 | $ 61
Net amounts presented on Balance Sheets | 320 | 61
Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 204 | 48
Gross amounts offset | (25) | (3)
Net amounts presented on Balance Sheets | 179 | 45
Noncurrent assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 116 | 13
Gross amounts offset | (23) | (5)
Net amounts presented on Balance Sheets | 93 | 8
Duke Energy Carolinas |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 162 | 20
Net amounts presented on Balance Sheets | 162 | 20
Duke Energy Carolinas | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 99 | 14
Gross amounts offset | (16) | (2)
Net amounts presented on Balance Sheets | 83 | 12
Duke Energy Carolinas | Noncurrent assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 63 | 6
Gross amounts offset | (15) | (1)
Net amounts presented on Balance Sheets | 48 | 5
Progress Energy |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 124 | 33
Net amounts presented on Balance Sheets | 124 | 33
Progress Energy | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 74 | 27
Gross amounts offset | (9) | (2)
Net amounts presented on Balance Sheets | 65 | 25
Progress Energy | Noncurrent assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 50 | 6
Gross amounts offset | (8) | (4)
Net amounts presented on Balance Sheets | 42 | 2
Duke Energy Progress |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 124 | 33
Net amounts presented on Balance Sheets | 124 | 33
Duke Energy Progress | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 74 | 27
Gross amounts offset | (9) | (2)
Net amounts presented on Balance Sheets | 65 | 25
Duke Energy Progress | Noncurrent assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 50 | 6
Gross amounts offset | (8) | (4)
Net amounts presented on Balance Sheets | 42 | 2
Duke Energy Ohio |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 2 | 1
Duke Energy Ohio | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 2 | 1
Net amounts presented on Balance Sheets | 2 | 1
Duke Energy Indiana |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 23 | 6
Net amounts presented on Balance Sheets | 23 | 6
Duke Energy Indiana | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 23 | 6
Net amounts presented on Balance Sheets | 23 | 6
Piedmont |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 3 | 1
Net amounts presented on Balance Sheets | 3 | 1
Piedmont | Current Assets |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 3 | 1
Net amounts presented on Balance Sheets | $ 3 | $ 1

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