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Debt and Credit Facilities (Schedule of Other Credit Facilities) (Details) - USD ($)
2 Months Ended 3 Months Ended
Feb. 28, 2019
Mar. 31, 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   1,400,000,000
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
Piedmont Natural Gas [Member] | Term Loan Facility [Member]    
Line of Credit Facility [Line Items]    
Facility size   350,000,000
Amount Drawn   $ 350,000,000
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