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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Jan. 31, 2021
Jun. 30, 2020
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-32853    
Entity Registrant Name DUKE ENERGY CORPORATION    
Entity Tax Identification Number 20-2777218    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 550 South Tryon Street    
Entity Address, City or Town Charlotte    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 28202-1803    
City Area Code 704    
Local Phone Number 382-3853    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 58,688,204,289
Entity Common Stock, Shares Outstanding   768,663,580  
Documents Incorporated by Reference
Portions of the Duke Energy definitive proxy statement for the 2021 Annual Meeting of the Shareholders or an amendment to this Annual Report are incorporated by reference into PART III, Items 10, 11 and 13 hereof.
This combined Form 10-K is filed separately by eight registrants: Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont (collectively the Duke Energy Registrants). Information contained herein relating to any individual registrant is filed by such registrant solely on its own behalf. Each registrant makes no representation as to information relating exclusively to the other registrants.
Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, Duke Energy Indiana and Piedmont meet the conditions set forth in General Instructions I(1)(a) and (b) of Form 10-K and are, therefore, filing this Form 10-K with the reduced disclosure format specified in General Instructions I(2) of Form 10-K. 		   
Entity Central Index Key 0001326160    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol DUK    
Security Exchange Name NYSE    
Junior Subordinated Debentures 5.125% Coupon Due January 2073      
Document Information [Line Items]      
Title of 12(b) Security 5.125% Junior Subordinated Debentures    
Trading Symbol DUKH    
Security Exchange Name NYSE    
Junior Subordinated Debentures 5.625% Coupon Due September 2078      
Document Information [Line Items]      
Title of 12(b) Security 5.625% Junior Subordinated Debentures    
Trading Symbol DUKB    
Security Exchange Name NYSE    
Depositary Share      
Document Information [Line Items]      
Title of 12(b) Security Depositary Shares    
Trading Symbol DUK PR A    
Security Exchange Name NYSE    
Duke Energy Carolinas      
Document Information [Line Items]      
Entity File Number 1-4928    
Entity Registrant Name DUKE ENERGY CAROLINAS, LLC    
Entity Tax Identification Number 56-0205520    
Entity Incorporation, State or Country Code NC    
Entity Address, Address Line One 526 South Church Street    
Entity Address, City or Town Charlotte    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 28202-1803    
City Area Code 704    
Local Phone Number 382-3853    
Entity Well-known Seasoned Issuer Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Central Index Key 0000030371    
Progress Energy      
Document Information [Line Items]      
Entity File Number 1-15929    
Entity Registrant Name PROGRESS ENERGY, INC.    
Entity Tax Identification Number 56-2155481    
Entity Incorporation, State or Country Code NC    
Entity Address, Address Line One 410 South Wilmington Street    
Entity Address, City or Town Raleigh    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 27601-1748    
City Area Code 704    
Local Phone Number 382-3853    
Entity Well-known Seasoned Issuer No    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Central Index Key 0001094093    
Duke Energy Progress      
Document Information [Line Items]      
Entity File Number 1-3382    
Entity Registrant Name DUKE ENERGY PROGRESS, LLC    
Entity Tax Identification Number 56-0165465    
Entity Incorporation, State or Country Code NC    
Entity Address, Address Line One 410 South Wilmington Street    
Entity Address, City or Town Raleigh    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 27601-1748    
City Area Code 704    
Local Phone Number 382-3853    
Entity Well-known Seasoned Issuer Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Central Index Key 0000017797    
Duke Energy Florida      
Document Information [Line Items]      
Entity File Number 1-3274    
Entity Registrant Name DUKE ENERGY FLORIDA, LLC    
Entity Tax Identification Number 59-0247770    
Entity Incorporation, State or Country Code FL    
Entity Address, Address Line One 299 First Avenue North    
Entity Address, City or Town St. Petersburg    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33701    
City Area Code 704    
Local Phone Number 382-3853    
Entity Well-known Seasoned Issuer Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Central Index Key 0000037637    
Duke Energy Ohio      
Document Information [Line Items]      
Entity File Number 1-1232    
Entity Registrant Name DUKE ENERGY OHIO, INC.    
Entity Tax Identification Number 31-0240030    
Entity Incorporation, State or Country Code OH    
Entity Address, Address Line One 139 East Fourth Street    
Entity Address, City or Town Cincinnati    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 45202    
City Area Code 704    
Local Phone Number 382-3853    
Entity Well-known Seasoned Issuer Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Central Index Key 0000020290    
Duke Energy Indiana      
Document Information [Line Items]      
Entity File Number 1-3543    
Entity Registrant Name DUKE ENERGY INDIANA, LLC    
Entity Tax Identification Number 35-0594457    
Entity Incorporation, State or Country Code IN    
Entity Address, Address Line One 1000 East Main Street    
Entity Address, City or Town Plainfield    
Entity Address, State or Province IN    
Entity Address, Postal Zip Code 46168    
City Area Code 704    
Local Phone Number 382-3853    
Entity Well-known Seasoned Issuer Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Central Index Key 0000081020    
Piedmont      
Document Information [Line Items]      
Entity File Number 1-6196    
Entity Registrant Name PIEDMONT NATURAL GAS COMPANY, INC.    
Entity Tax Identification Number 56-0556998    
Entity Incorporation, State or Country Code NC    
Entity Address, Address Line One 4720 Piedmont Row Drive    
Entity Address, City or Town Charlotte    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 28210    
City Area Code 704    
Local Phone Number 364-3120    
Entity Well-known Seasoned Issuer Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Central Index Key 0000078460