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Debt and Credit Facilities (Schedule of Other Credit Facilities) (Details) - USD ($)
2 Months Ended 6 Months Ended
Feb. 28, 2019
Jun. 30, 2019
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Facility size   $ 8,000,000,000
Duke Energy Progress [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Facility size   1,250,000,000
Duke Energy Progress [Member] | Term Loan Facility [Member]    
Line of Credit Facility [Line Items]    
Facility size   700,000,000
Amount drawn   700,000,000
Drawings on credit facility $ 650,000,000  
Piedmont Natural Gas [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Facility size   $ 500,000,000
Duke Energy (Parent) Three-Year Revolving Credit Facility [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Facility Term   3 years
Facility size   $ 1,000,000,000
Amount drawn   $ 500,000,000