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Summary of Significant Accounting Policies (Other Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Current Assets    
Organization And Basis Of Presentation [Line Items]    
Taxes receivable $ 357 $ 729
Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Accrued compensation 862 793
Duke Energy Carolinas | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Accrued compensation 271 251
Other accrued liabilities 147 55
Progress Energy | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Customer deposits 354 345
Duke Energy Florida | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Other accrued liabilities 89 85
Customer deposits 209 208
Duke Energy Indiana | Current Assets    
Organization And Basis Of Presentation [Line Items]    
Taxes receivable 44 9
Duke Energy Indiana | Current Liabilities    
Organization And Basis Of Presentation [Line Items]    
Customer deposits $ 49 $ 47