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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Legal Reserves | The following tables contain information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Other within Other Noncurrent Liabilities on the Consolidated Balance Sheets.
(in millions) | December 31, 2021 |  | December 31, 2020 |
Reserves for Environmental Remediation |  |  |  |
Duke Energy | $ | 88 |  |  | $ | 75 |  |
Duke Energy Carolinas | 19 |  |  | 19 |  |
Progress Energy | 23 |  |  | 19 |  |
Duke Energy Progress | 11 |  |  | 6 |  |
Duke Energy Florida | 11 |  |  | 12 |  |
Duke Energy Ohio | 34 |  |  | 22 |  |
Duke Energy Indiana | 4 |  |  | 6 |  |
Piedmont | 9 |  |  | 10 |  |
Schedule of Purchase Power Obligations | The following table presents executory purchased power contracts with terms exceeding one year, excluding contracts classified as leases.
|  |  | Minimum Purchase Amount at December 31, 2021
| Contract |  |  |  |  |  |  |  |  |  |  |  |  |  |
(in millions) | Expiration |  | 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026 |  | Thereafter |  | Total
Duke Energy Progress(a) | 2028-2032 |  | $ | 22 |  |  | $ | 22 |  |  | $ | 21 |  |  | $ | 22 |  |  | $ | 18 |  |  | $ | 45 |  |  | $ | 150 |
Duke Energy Florida(b) | 2023-2025 |  | 354 |  |  | 374 |  |  | 262 |  |  | 91 |  |  | — |  |  | — |  |  | 1,081 |
Duke Energy Ohio(c)(d) | 2023 |  | 53 |  |  | 34 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 87 |
(a) Contracts represent between 18% and 100% of net plant output. (b) Contracts represent 100% of net plant output. (c) Contracts represent 15% of net plant output. (d) Excludes PPA with OVEC. See Note 17 for additional information.
Schedule of Natural Gas Supply Contract Commitments | The following table presents future unconditional purchase obligations under natural gas supply and capacity contracts as of December 31, 2021.
(in millions) | 2022 |  | 2023 |  | 2024 |  | 2025 | 2026 | Thereafter | Total
Duke Energy Ohio | $ | 62 |  |  | $ | 37 |  |  | $ | 25 |  |  | $ | 16 |  | $ | 13 |  | $ | 47 |  | $ | 200 |
Piedmont | 324 |  |  | 272 |  |  | 225 |  |  | 134 |  | 122 |  | 503 |  | 1,580 |

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- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
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