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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 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 Other within Other Noncurrent Liabilities on the Condensed Consolidated Balance Sheets.
(in millions)September 30, 2021December 31, 2020
Reserves for Environmental Remediation
Duke Energy$74 $75 
Duke Energy Carolinas19 19 
Progress Energy17 19 
Duke Energy Progress6 
Duke Energy Florida11 12 
Duke Energy Ohio21 22 
Duke Energy Indiana5 
Piedmont12 10