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Other Income and Expenses, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | $ 16 | $ 32 | $ 31
AFUDC equity | 171 | 154 | 139
Post in-service equity returns | 39 | 27 | 29
Nonoperating income, other | 417 | 240 | 231
Other income and expense, net | 643 | 453 | 430
Duke Energy Carolinas |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 4 | 4 | 1
AFUDC equity | 65 | 62 | 42
Post in-service equity returns | 21 | 17 | 20
Nonoperating income, other | 180 | 94 | 88
Other income and expense, net | 270 | 177 | 151
Progress Energy |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 8 | 8 | 11
AFUDC equity | 51 | 42 | 66
Post in-service equity returns | 16 | 8 | 7
Nonoperating income, other | 140 | 71 | 57
Other income and expense, net | 215 | 129 | 141
Duke Energy Progress |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 6 | 2 |
AFUDC equity | 34 | 29 | 60
Post in-service equity returns | 16 | 8 | 7
Nonoperating income, other | 87 | 36 | 33
Other income and expense, net | 143 | 75 | 100
Duke Energy Florida |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 2 | 6 | 11
AFUDC equity | 16 | 12 | 6
Nonoperating income, other | 53 | 35 | 31
Other income and expense, net | 71 | 53 | 48
Duke Energy Ohio |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 4 | 4 | 10
AFUDC equity | 7 | 7 | 13
Post in-service equity returns | 1 | 1 | 1
Nonoperating income, other | 6 | 4 |
Other income and expense, net | 18 | 16 | 24
Duke Energy Indiana |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 6 | 6 | 10
AFUDC equity | 27 | 23 | 18
Post in-service equity returns | 1 | 1 |
Nonoperating income, other | 8 | 7 | 13
Other income and expense, net | 42 | 37 | 41
Piedmont |  |  |
Component Of Other Income Expense Nonoperating [Line Items] |  |  |
Interest income | 19 | 17 | 1
AFUDC equity | 20 | 19 |
Nonoperating income, other | 16 | 15 | 19
Other income and expense, net | $ 55 | $ 51 | $ 20

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