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Other Income and Expenses, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | $ 32 | $ 31 | $ 20
AFUDC equity | 154 | 139 | 221
Post in-service equity returns | 27 | 29 | 15
Nonoperating income, other | 240 | 231 | 143
Other income and expense, net | 453 | 430 | 399
Duke Energy Carolinas |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 4 | 1 | 1
AFUDC equity | 62 | 42 | 73
Post in-service equity returns | 17 | 20 | 9
Nonoperating income, other | 94 | 88 | 70
Other income and expense, net | 177 | 151 | 153
Progress Energy |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 8 | 11 | 18
AFUDC equity | 42 | 66 | 104
Post in-service equity returns | 8 | 7 | 5
Nonoperating income, other | 71 | 57 | 38
Other income and expense, net | 129 | 141 | 165
Duke Energy Progress |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 2 | 0 | 1
AFUDC equity | 29 | 60 | 57
Post in-service equity returns | 8 | 7 | 5
Nonoperating income, other | 36 | 33 | 24
Other income and expense, net | 75 | 100 | 87
Duke Energy Florida |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 6 | 11 | 18
AFUDC equity | 12 | 6 | 47
Nonoperating income, other | 35 | 31 | 21
Other income and expense, net | 53 | 48 | 86
Duke Energy Ohio |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 4 | 10 | 7
AFUDC equity | 7 | 13 | 11
Post in-service equity returns | 1 | 1 | 1
Nonoperating income, other | 4 | 0 | 4
Other income and expense, net | 16 | 24 | 23
Duke Energy Indiana |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 6 | 10 | 9
AFUDC equity | 23 | 18 | 32
Post in-service equity returns | 1 |  |
Nonoperating income, other | 7 | 13 | 4
Other income and expense, net | 37 | 41 | 45
Piedmont |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 17 | 1 | 1
AFUDC equity | 19 |  |
Nonoperating income, other | 15 | 19 | 13
Other income and expense, net | $ 51 | $ 20 | $ 14

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