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Other Income and Expenses, Net (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Income and Expenses [Abstract] |
Schedule of Other Income and Expenses, Net | The components of Other income and expenses, net on the Consolidated Statements of Operations are as follows.
| Year Ended December 31, 2020
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Interest income | $ | 32 |  |  | $ | 4 |  |  | $ | 8 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 4 |  |  | $ | 6 |  |  | $ | 17 |
AFUDC equity | 154 |  |  | 62 |  |  | 42 |  |  | 29 |  |  | 12 |  |  | 7 |  |  | 23 |  |  | 19 |
Post in-service equity returns | 27 |  |  | 17 |  |  | 8 |  |  | 8 |  |  | — |  |  | 1 |  |  | 1 |  |  | — |
Nonoperating income, other | 240 |  |  | 94 |  |  | 71 |  |  | 36 |  |  | 35 |  |  | 4 |  |  | 7 |  |  | 15 |
Other income and expense, net | $ | 453 |  |  | $ | 177 |  |  | $ | 129 |  |  | $ | 75 |  |  | $ | 53 |  |  | $ | 16 |  |  | $ | 37 |  |  | $ | 51 |
| Year Ended December 31, 2019
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Interest income | $ | 31 |  |  | $ | 1 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 11 |  |  | $ | 10 |  |  | $ | 10 |  |  | $ | 1 |
AFUDC equity | 139 |  |  | 42 |  |  | 66 |  |  | 60 |  |  | 6 |  |  | 13 |  |  | 18 |  |  | — |
Post in-service equity returns | 29 |  |  | 20 |  |  | 7 |  |  | 7 |  |  | — |  |  | 1 |  |  | — |  |  | — |
Nonoperating income, other | 231 |  |  | 88 |  |  | 57 |  |  | 33 |  |  | 31 |  |  | — |  |  | 13 |  |  | 19 |
Other income and expense, net | $ | 430 |  |  | $ | 151 |  |  | $ | 141 |  |  | $ | 100 |  |  | $ | 48 |  |  | $ | 24 |  |  | $ | 41 |  |  | $ | 20 |
| Year Ended December 31, 2018 |  |
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Interest income | $ | 20 |  |  | $ | 1 |  |  | $ | 18 |  |  | $ | 1 |  |  | $ | 18 |  |  | $ | 7 |  |  | $ | 9 |  |  | $ | 1 |
AFUDC equity | 221 |  |  | 73 |  |  | 104 |  |  | 57 |  |  | 47 |  |  | 11 |  |  | 32 |  |  | — |
Post in-service equity returns | 15 |  |  | 9 |  |  | 5 |  |  | 5 |  |  | — |  |  | 1 |  |  | — |  |  | — |
Nonoperating income, other | 143 |  |  | 70 |  |  | 38 |  |  | 24 |  |  | 21 |  |  | 4 |  |  | 4 |  |  | 13 |
Other income and expense, net | $ | 399 |  |  | $ | 153 |  |  | $ | 165 |  |  | $ | 87 |  |  | $ | 86 |  |  | $ | 23 |  |  | $ | 45 |  |  | $ | 14 |

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration