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Income Taxes (Other Disclosures) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Unrecognized tax benefits – January 1 |  | $ 51 | $ 125 | $ 126
Gross decreases – tax positions in prior periods(a) |  |  | (86) | (2)
Gross increases – current period tax positions |  | 14 | 12 | 4
Reduction due to lapse of statute of limitations |  |  |  | (3)
Total changes |  | 14 | (74) | (1)
Unrecognized tax benefits – December 31 | $ 51 | 65 | 51 | 125
Amount that if recognized, would affect the effective tax rate or regulatory liability |  | 59 |  |
Federal capital gain | 426 |  |  |
Duke Energy Carolinas |  |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Unrecognized tax benefits – January 1 |  | 13 | 10 | 8
Gross increases – current period tax positions |  | 4 | 3 | 2
Total changes |  | 4 | 3 | 2
Unrecognized tax benefits – December 31 | 13 | 17 | 13 | 10
Amount that if recognized, would affect the effective tax rate or regulatory liability |  | 17 |  |
Progress Energy |  |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Unrecognized tax benefits – January 1 |  | 15 | 10 | 9
Gross increases – current period tax positions |  | 4 | 5 | 1
Total changes |  | 4 | 5 | 1
Unrecognized tax benefits – December 31 | 15 | 19 | 15 | 10
Amount that if recognized, would affect the effective tax rate or regulatory liability |  | 18 |  |
Duke Energy Progress |  |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Unrecognized tax benefits – January 1 |  | 10 | 6 | 6
Gross increases – current period tax positions |  | 3 | 4 |
Total changes |  | 3 | 4 |
Unrecognized tax benefits – December 31 | 10 | 13 | 10 | 6
Amount that if recognized, would affect the effective tax rate or regulatory liability |  | 13 |  |
Duke Energy Florida |  |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Unrecognized tax benefits – January 1 |  | 4 | 3 | 3
Gross increases – current period tax positions |  | 1 | 1 |
Total changes |  | 1 | 1 |
Unrecognized tax benefits – December 31 | 4 | 5 | 4 | 3
Amount that if recognized, would affect the effective tax rate or regulatory liability |  | 5 |  |
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
Unrecognized tax benefits – December 31 | 1 | 1 | 1 | 1
Amount that if recognized, would affect the effective tax rate or regulatory liability |  | 1 |  |
Duke Energy Indiana |  |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Unrecognized tax benefits – January 1 |  | 2 | 1 | 1
Gross increases – current period tax positions |  |  | 1 |
Total changes |  |  | 1 |
Unrecognized tax benefits – December 31 | 2 | 2 | 2 | 1
Amount that if recognized, would affect the effective tax rate or regulatory liability |  | 2 |  |
Piedmont |  |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Unrecognized tax benefits – January 1 |  | 4 | 1 | 4
Gross increases – current period tax positions |  | 5 | 3 |
Reduction due to lapse of statute of limitations |  |  |  | (3)
Total changes |  | 5 | 3 | (3)
Unrecognized tax benefits – December 31 | $ 4 | 9 | $ 4 | $ 1
Amount that if recognized, would affect the effective tax rate or regulatory liability |  | $ 8 |  |

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