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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2024
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 Accounts Payable within Other Current Liabilities and Other within Other Noncurrent Liabilities on the Consolidated Balance Sheets.
(in millions)December 31, 2024December 31, 2023
Reserves for Environmental Remediation
Duke Energy$73 $88 
Duke Energy Carolinas24 23 
Progress Energy19 19 
Duke Energy Progress9 9 
Duke Energy Florida10 10 
Duke Energy Ohio21 36 
Duke Energy Indiana2 2 
Piedmont7 7 
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, 2024
Contract
(in millions) Expiration20252026202720282029ThereafterTotal
Duke Energy Progress(a)
2028-2042
$22 $18 $19 $18 $3 $31 $111 
Duke Energy Indiana(b)
2026
33 12 — — — — 45 
(a)    Contracts represent between 18% and 100% of net plant output.
(b)    Share of net plant output varies.
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, 2024.
(in millions)20252026202720282029ThereafterTotal
Duke Energy Ohio$104 $75 $71 $69 $65 $554 $938 
Piedmont369 366 322 241 233 695 2,226