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Investments in Debt and Equity Securities (Equity Securities, FV-NI - ASU 2016-01) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]          
Equity securities, FV-NI, realized gain $ 66 $ 47 $ 101 $ 66  
Equity securities, FV-NI, realized loss 63 31 93 44  
Ndtf [Member]          
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]          
Equity Securities, FV-NI, Accumulated Unrealized Gain 3,076   3,076   $ 2,402
Equity Securities, FV-NI, Accumulated Unrealized Loss 36   36   95
Equity securities, FV-NI 5,178   5,178   4,475
Other Classification [Member]          
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]          
Equity Securities, FV-NI, Accumulated Unrealized Gain 49   49   36
Equity Securities, FV-NI, Accumulated Unrealized Loss         1
Equity securities, FV-NI 112   112   99
Duke Energy Carolinas [Member]          
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]          
Equity securities, FV-NI, realized gain 44 26 67 36  
Equity securities, FV-NI, realized loss 48 17 69 22  
Duke Energy Carolinas [Member] | Ndtf [Member]          
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]          
Equity Securities, FV-NI, Accumulated Unrealized Gain 1,671   1,671   1,309
Equity Securities, FV-NI, Accumulated Unrealized Loss 9   9   54
Equity securities, FV-NI 2,883   2,883   2,484
Progress Energy [Member]          
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]          
Equity securities, FV-NI, realized gain 22 21 34 30  
Equity securities, FV-NI, realized loss 15 14 24 22  
Progress Energy [Member] | Ndtf [Member]          
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]          
Equity Securities, FV-NI, Accumulated Unrealized Gain 1,405   1,405   1,093
Equity Securities, FV-NI, Accumulated Unrealized Loss 27   27   41
Equity securities, FV-NI 2,295   2,295   1,991
Duke Energy Progress [Member]          
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]          
Equity securities, FV-NI, realized gain 7 17 17 25  
Equity securities, FV-NI, realized loss 7 12 15 20  
Duke Energy Progress [Member] | Ndtf [Member]          
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]          
Equity Securities, FV-NI, Accumulated Unrealized Gain 1,092   1,092   833
Equity Securities, FV-NI, Accumulated Unrealized Loss 24   24   30
Equity securities, FV-NI 1,886   1,886   1,588
Duke Energy Florida [Member]          
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]          
Equity securities, FV-NI, realized gain 15 4 17 5  
Equity securities, FV-NI, realized loss 8 $ 2 9 $ 2  
Duke Energy Florida [Member] | Ndtf [Member]          
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]          
Equity Securities, FV-NI, Accumulated Unrealized Gain 313   313   260
Equity Securities, FV-NI, Accumulated Unrealized Loss 3   3   11
Equity securities, FV-NI 409   409   403
Duke Energy Indiana [Member]          
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]          
Equity Securities, FV-NI, Accumulated Unrealized Gain 37   37   29
Equity securities, FV-NI 74   74   67
Duke Energy Indiana [Member] | Other Classification [Member]          
Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]          
Equity securities, FV-NI $ 74   $ 74   $ 67