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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of 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 Current Liabilities and Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets.
(in millions)June 30, 2021December 31, 2020
Reserves for Environmental Remediation
Duke Energy$74 $75 
Duke Energy Carolinas20 19 
Progress Energy18 19 
Duke Energy Progress6 6 
Duke Energy Florida12 12 
Duke Energy Ohio21 22 
Duke Energy Indiana5 6 
Piedmont11 10 
The table below presents recorded reserves based on management’s best estimate of probable loss for legal matters, excluding asbestos-related reserves discussed above. Reserves are classified on the Condensed 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.
(in millions)June 30, 2021December 31, 2020
Reserves for Legal Matters
Duke Energy$65 $68 
Duke Energy Carolinas2 2 
Progress Energy58 61 
Duke Energy Progress12 13 
Duke Energy Florida26 28 
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$20 
Duke Energy Carolinas12 
Duke Energy Ohio4