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Other Income and Expenses, Net | 12 Months Ended
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Dec. 31, 2018
Other Income and Expenses [Abstract] |
Other Income and Expenses, Net | 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 The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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