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Other Income and Expenses, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | $ 31 | $ 20 | $ 13
AFUDC equity | 139 | 221 | 237
Post in-service equity returns | 29 | 15 | 40
Nonoperating income, other | 231 | 143 | 218
Other income and expense, net | 430 | 399 | 508
Duke Energy Carolinas |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 1 | 1 | 2
AFUDC equity | 42 | 73 | 106
Post in-service equity returns | 20 | 9 | 28
Nonoperating income, other | 88 | 70 | 63
Other income and expense, net | 151 | 153 | 199
Progress Energy |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 11 | 18 | 6
AFUDC equity | 66 | 104 | 92
Post in-service equity returns | 7 | 5 | 12
Nonoperating income, other | 57 | 38 | 99
Other income and expense, net | 141 | 165 | 209
Duke Energy Progress |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income |  | 1 | 2
AFUDC equity | 60 | 57 | 47
Post in-service equity returns | 7 | 5 | 12
Nonoperating income, other | 33 | 24 | 54
Other income and expense, net | 100 | 87 | 115
Duke Energy Florida |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 11 | 18 | 5
AFUDC equity | 6 | 47 | 45
Nonoperating income, other | 31 | 21 | 46
Other income and expense, net | 48 | 86 | 96
Duke Energy Ohio |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 10 | 7 | 6
AFUDC equity | 13 | 11 | 11
Post in-service equity returns | 1 | 1 |
Nonoperating income, other |  | 4 | 6
Other income and expense, net | 24 | 23 | 23
Duke Energy Indiana |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 10 | 9 | 8
AFUDC equity | 18 | 32 | 28
Post in-service equity returns | 0 |  |
Nonoperating income, other | 13 | 4 | 11
Other income and expense, net | 41 | 45 | 47
Piedmont |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 1 | 1 |
Nonoperating income, other | 19 | 13 | (11)
Other income and expense, net | $ 20 | $ 14 | $ (11)

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