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Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
FV-NI:      
Realized gains $ 172 $ 168  
Realized losses 151 126  
AFS:      
Realized gains 94 22  
Realized losses 67 51  
Available-for-sale Securities, Realized Gain (Loss) [Abstract]      
Realized gains     $ 202
Realized losses     160
Duke Energy Carolinas      
FV-NI:      
Realized gains 113 89  
Realized losses 107 73  
AFS:      
Realized gains 55 19  
Realized losses 38 35  
Available-for-sale Securities, Realized Gain (Loss) [Abstract]      
Realized gains     135
Realized losses     103
Progress Energy      
FV-NI:      
Realized gains 59 79  
Realized losses 44 53  
AFS:      
Realized gains 36 3  
Realized losses 29 15  
Available-for-sale Securities, Realized Gain (Loss) [Abstract]      
Realized gains     65
Realized losses     56
Duke Energy Progress      
FV-NI:      
Realized gains 38 68  
Realized losses 33 48  
AFS:      
Realized gains 7 2  
Realized losses 5 10  
Available-for-sale Securities, Realized Gain (Loss) [Abstract]      
Realized gains     54
Realized losses     48
Duke Energy Florida      
FV-NI:      
Realized gains 21 11  
Realized losses 11 5  
AFS:      
Realized gains 29 1  
Realized losses $ 24 $ 5  
Available-for-sale Securities, Realized Gain (Loss) [Abstract]      
Realized gains     11
Realized losses     $ 8