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Other Income and Expenses, Net (Tables) | 12 Months Ended
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Dec. 31, 2018
Component Of Other Income Expense Nonoperating [Line Items] |
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, 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 |
| Year Ended December 31, 2017
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |  |  |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |  |  |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |  |  | Piedmont |
Interest income | $ | 13 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 2 |  |  | $ | 5 |  |  | $ | 6 |  |  | $ | 8 |  |  | $ | — |
AFUDC equity | 237 |  |  | 106 |  |  | 92 |  |  | 47 |  |  | 45 |  |  | 11 |  |  | 28 |  |  | — |
Post in-service equity returns | 40 |  |  | 28 |  |  | 12 |  |  | 12 |  |  | — |  |  | — |  |  | — |  |  | — |
Nonoperating income, other | 218 |  |  | 63 |  |  | 99 |  |  | 54 |  |  | 46 |  |  | 6 |  |  | 11 |  |  | (11 | )
Other income and expense, net | $ | 508 |  |  | $ | 199 |  |  | $ | 209 |  |  | $ | 115 |  |  | $ | 96 |  |  | $ | 23 |  |  | $ | 47 |  |  | $ | (11 | )
| Year Ended December 31, 2016
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |
Interest income | $ | 21 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | 5 |  |  | $ | 6 |
AFUDC equity | 200 |  |  | 102 |  |  | 76 |  |  | 50 |  |  | 26 |  |  | 6 |  |  | 16 |
Post in-service equity returns | 67 |  |  | 55 |  |  | 12 |  |  | 12 |  |  | — |  |  | — |  |  | — |
Nonoperating income, other | 175 |  |  | 53 |  |  | 94 |  |  | 67 |  |  | 35 |  |  | — |  |  | 4 |
Other income and expense, net(a) | $ | 463 |  |  | $ | 214 |  |  | $ | 186 |  |  | $ | 132 |  |  | $ | 63 |  |  | $ | 11 |  |  | $ | 26 |
(a) | Amounts for Piedmont for the two months ended December 31, 2016, and for the year ended October 31, 2016, were not material.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of interest income and income classified as other. + References No definition available. + Details
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