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Other Income and Expenses, Net (Details) - USD ($) $ in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Component Of Other Income Expense Nonoperating [Line Items] |  |  |  |  |
Interest income |  | $ 20 | $ 13 | $ 21 |
AFUDC equity |  | 221 | 237 | 200 |
Post in-service equity returns |  | 15 | 40 | 67 |
Nonoperating income (expense), other |  | 143 | 218 | 175 |
Other income and expenses, net |  | 399 | 508 | 463 |
Duke Energy Carolinas [Member] |  |  |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |  |  |
Interest income |  | 1 | 2 | 4 |
AFUDC equity |  | 73 | 106 | 102 |
Post in-service equity returns |  | 9 | 28 | 55 |
Nonoperating income (expense), other |  | 70 | 63 | 53 |
Other income and expenses, net |  | 153 | 199 | 214 |
Progress Energy [Member] |  |  |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |  |  |
Interest income |  | 18 | 6 | 4 |
AFUDC equity |  | 104 | 92 | 76 |
Post in-service equity returns |  | 5 | 12 | 12 |
Nonoperating income (expense), other |  | 38 | 99 | 94 |
Other income and expenses, net |  | 165 | 209 | 186 |
Duke Energy Progress [Member] |  |  |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |  |  |
Interest income |  | 1 | 2 | 3 |
AFUDC equity |  | 57 | 47 | 50 |
Post in-service equity returns |  | 5 | 12 | 12 |
Nonoperating income (expense), other |  | 24 | 54 | 67 |
Other income and expenses, net |  | 87 | 115 | 132 |
Duke Energy Florida [Member] |  |  |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |  |  |
Interest income |  | 18 | 5 | 2 |
AFUDC equity |  | 47 | 45 | 26 |
Nonoperating income (expense), other |  | 21 | 46 | 35 |
Other income and expenses, net |  | 86 | 96 | 63 |
Duke Energy Ohio [Member] |  |  |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |  |  |
Interest income |  | 7 | 6 | 5 |
AFUDC equity |  | 11 | 11 | 6 |
Post in-service equity returns |  | 1 |  |  |
Nonoperating income (expense), other |  | 4 | 6 |  |
Other income and expenses, net |  | 23 | 23 | 11 |
Duke Energy Indiana [Member] |  |  |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |  |  |
Interest income |  | 9 | 8 | 6 |
AFUDC equity |  | 32 | 28 | 16 |
Nonoperating income (expense), other |  | 4 | 11 | 4 |
Other income and expenses, net |  | 45 | 47 | $ 26 |
Piedmont Natural Gas [Member] |  |  |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |  |  |
Interest income |  | 1 |  |  |
Nonoperating income (expense), other |  | 13 | (11) |  |
Other income and expenses, net | $ (2) | $ 14 | $ (11) |  | $ (1)

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