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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020December 31, 2019
Reserves for Environmental Remediation
Duke Energy$75 $58 
Duke Energy Carolinas19 11 
Progress Energy19 16 
Duke Energy Progress6 4 
Duke Energy Florida12 9 
Duke Energy Ohio22 19 
Duke Energy Indiana6 4 
Piedmont10 8 
The table below presents recorded reserves based on management’s best estimate of probable loss for legal matters, excluding asbestos-related reserves. Reserves are classified on the Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Other within Current Liabilities. The reasonably possible range of loss in excess of recorded reserves is not material, other than as described above.
 December 31,
(in millions)20202019
Reserves for Legal Matters  
Duke Energy$68 $62 
Duke Energy Carolinas2 2 
Progress Energy 61 55 
Duke Energy Progress 13 12 
Duke Energy Florida28 22 
Piedmont1 1 
Schedule of Additional Possible Losses in Excess of Recorded Environmental Reserves
Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are not material except as presented in the table below.
(in millions)
Duke Energy$25 
Duke Energy Carolinas12 
Duke Energy Ohio4 
Piedmont2 
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, 2020
Contract
(in millions) Expiration20212022202320242025ThereafterTotal
Duke Energy Progress(a)
2025-2032$66 $73 $66 $67 $69 $69 $410 
Duke Energy Florida(b)
2023-2025335 354 374 262 91 — 1,416 
Duke Energy Ohio(c)(d)
2022130 55 — — — — 185 
(a)    Contracts represent either 100% of net plant output or vary.
(b)    Contracts represent 100% of net plant output.
(c)    Contracts represent between 1% and 11% 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, 2020.
(in millions)Duke EnergyDuke Energy OhioPiedmont
2021$311 $41 $270 
2022270 28 242 
2023197 20 177 
2024139 17 122 
2025125 14 111 
Thereafter662 60 602 
Total$1,704 $180 $1,524