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Cover Page - shares
6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Document Information [Line Items]    
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Document Transition Report false  
Document Quarterly Report true  
Entity Registrant Name DUKE ENERGY CORP  
Entity Central Index Key 0001326160  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Entity File Number 1-32853  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   728,601,060
Entity Emerging Growth Company false  
Entity Small Business false  
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  
Duke Energy Carolinas [Member]    
Document Information [Line Items]    
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Entity Registrant Name DUKE ENERGY CAROLINAS, LLC  
Entity Central Index Key 0000030371  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity File Number 1-4928  
Entity Emerging Growth Company false  
Entity Small Business false  
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  
Progress Energy [Member]    
Document Information [Line Items]    
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Entity Registrant Name PROGRESS ENERGY, INC.  
Entity Central Index Key 0001094093  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity File Number 1-15929  
Entity Emerging Growth Company false  
Entity Small Business false  
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  
Duke Energy Progress [Member]    
Document Information [Line Items]    
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Entity Registrant Name DUKE ENERGY PROGRESS, LLC  
Entity Central Index Key 0000017797  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity File Number 1-3382  
Entity Emerging Growth Company false  
Entity Small Business false  
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  
Duke Energy Florida [Member]    
Document Information [Line Items]    
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Entity Registrant Name DUKE ENERGY FLORIDA, LLC  
Entity Central Index Key 0000037637  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity File Number 1-3274  
Entity Small Business false  
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  
Duke Energy Ohio [Member]    
Document Information [Line Items]    
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Entity Registrant Name DUKE ENERGY OHIO, INC.  
Entity Central Index Key 0000020290  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity File Number 1-1232  
Entity Small Business false  
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  
Duke Energy Indiana [Member]    
Document Information [Line Items]    
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Entity Registrant Name DUKE ENERGY INDIANA, LLC  
Entity Central Index Key 0000081020  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity File Number 1-3543  
Entity Small Business false  
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  
Piedmont Natural Gas [Member]    
Document Information [Line Items]    
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Current Reporting Status Yes  
Entity Registrant Name PIEDMONT NATURAL GAS COMPANY, INC.  
Entity Central Index Key 0000078460  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity File Number 1-6196  
Entity Small Business false  
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  
Common Stock [Member]    
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 [Member]    
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 [Member]    
Document Information [Line Items]    
Title of 12(b) Security 5.625% Junior Subordinated Debentures  
Trading Symbol DUKB  
Security Exchange Name NYSE  
Depositary Share [Member]    
Document Information [Line Items]    
Title of 12(b) Security Depositary Shares  
Trading Symbol DUK PR A  
Security Exchange Name NYSE