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Income Taxes (Other Disclosures) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | $ 65 | $ 51 | $ 125
Gross decreases – tax positions in prior periods(a) | (15) |  | (86)
Gross increases – current period tax positions | 12 | 14 | 12
Total changes | (3) | 14 | (74)
Unrecognized tax benefits – December 31 | 62 | 65 | 51
Federal capital gain |  |  | 426
Amount that if recognized, would affect the effective tax rate or regulatory liability | 57 |  |
Valuation allowance | 544 | 519 |
Foreign Tax Credit |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Valuation allowance | 389 |  |
Federal Capital Loss |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Valuation allowance | 29 |  |
Duke Energy Carolinas |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 17 | 13 | 10
Gross increases – current period tax positions | 4 | 4 | 3
Total changes | 4 | 4 | 3
Unrecognized tax benefits – December 31 | 21 | 17 | 13
Amount that if recognized, would affect the effective tax rate or regulatory liability | 20 |  |
Progress Energy |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 19 | 15 | 10
Gross increases – current period tax positions | 5 | 4 | 5
Total changes | 5 | 4 | 5
Unrecognized tax benefits – December 31 | 24 | 19 | 15
Amount that if recognized, would affect the effective tax rate or regulatory liability | 22 |  |
Duke Energy Progress |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 13 | 10 | 6
Gross increases – current period tax positions | 5 | 3 | 4
Total changes | 5 | 3 | 4
Unrecognized tax benefits – December 31 | 18 | 13 | 10
Amount that if recognized, would affect the effective tax rate or regulatory liability | 16 |  |
Duke Energy Florida |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 5 | 4 | 3
Gross increases – current period tax positions | 1 | 1 | 1
Total changes | 1 | 1 | 1
Unrecognized tax benefits – December 31 | 6 | 5 | 4
Amount that if recognized, would affect the effective tax rate or regulatory liability | 6 |  |
Duke Energy Ohio |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 1 | 1 | 1
Gross increases – current period tax positions | 1 |  |
Total changes | 1 |  |
Unrecognized tax benefits – December 31 | 2 | 1 | 1
Amount that if recognized, would affect the effective tax rate or regulatory liability | 2 |  |
Duke Energy Indiana |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 2 | 2 | 1
Gross increases – current period tax positions | 1 |  | 1
Total changes | 1 |  | 1
Unrecognized tax benefits – December 31 | 3 | 2 | 2
Amount that if recognized, would affect the effective tax rate or regulatory liability | 3 |  |
Piedmont |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 9 | 4 | 1
Gross increases – current period tax positions | 2 | 5 | 3
Total changes | 2 | 5 | 3
Unrecognized tax benefits – December 31 | 11 | $ 9 | $ 4
Amount that if recognized, would affect the effective tax rate or regulatory liability | $ 10 |  |

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