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Commitments and Contingencies (Tables)
 12 Months Ended
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, 2021December 31, 2020
Reserves for Environmental Remediation
Duke Energy$88 $75 
Duke Energy Carolinas19 19 
Progress Energy23 19 
Duke Energy Progress11 6 
Duke Energy Florida11 12 
Duke Energy Ohio34 22 
Duke Energy Indiana4 6 
Piedmont9 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) Expiration20222023202420252026ThereafterTotal
Duke Energy Progress(a)
2028-2032$22 $22 $21 $22 $18 $45 $150 
Duke Energy Florida(b)
2023-2025354 374 262 91 — — 1,081 
Duke Energy Ohio(c)(d)
202353 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)20222023202420252026ThereafterTotal
Duke Energy Ohio$62 $37 $25 $16 $13 $47 $200 
Piedmont324 272 225 134 122 503 1,580