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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Legal Reserves
The following table contains 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, 2022December 31, 2021
Reserves for Environmental Remediation
Duke Energy$84 $88 
Duke Energy Carolinas22 19 
Progress Energy19 23 
Duke Energy Progress8 11 
Duke Energy Florida11 11 
Duke Energy Ohio33 34 
Duke Energy Indiana3 4 
Piedmont7 9 
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, 2022
Contract
(in millions) Expiration20232024202520262027ThereafterTotal
Duke Energy Progress(a)
2028-2032$22 $21 $22 $18 $19 $27 $129 
Duke Energy Florida(b)
2024-2025300 267 91 — — — 658 
Duke Energy Ohio(c)
202455 36 — — — — 91 
(a)    Contracts represent between 18% and 100% of net plant output.
(b)    Contracts represent 100% of net plant output.
(c)    Share of net plant output varies. Excludes PPA with OVEC.
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, 2022.
(in millions)20232024202520262027ThereafterTotal
Duke Energy Ohio$85 $101 $85 $56 $52 $616 $995 
Piedmont319 313 267 213 203 587 1,902