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Quarterly Financial Data (Unaudited) (Unusual or Infrequently Occurring Items) (Details) - USD ($)
$ in Millions
2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2016
Quarterly Financial Information Disclosure [Line Items]                          
Costs to achieve mergers, integration costs   $ (31) $ (16) $ (20) $ (17) $ (34) $ (23) $ (30) $ (16) $ (84) $ (103)    
Asset Impairment Charges                   (402) (282) $ (18)  
Sale of Retired Plant         107         107      
Severance Costs   (187)               (187) (15) (118)  
Income (Loss) From Discontinued Operations, net of tax   20 4 (5)   (2) (2) (2)   19 (6) (408)  
Tax Act                   (20) 112    
Total   (225) (106) (199) (341) 27 (242) (30) (16) (871) (261)    
Regulatory Impairments [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Asset Impairment Charges   (60) (93)   (55)         (208)      
Regulatory settlements [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Utilities Operating Expense, Impairments       (179) (86) (23) (135)     (265) (158)    
Commercial Renewables Impairment [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Asset Impairment Charges           (18) (84)       (102)    
Impacts of the Tax Act [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Tax Act   53 3   (76) 102       (20) 102    
Duke Energy Carolinas [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Costs to achieve mergers, integration costs   (1) (2) (2) (4) (5) (5) (6) (4) (9) (20)    
Asset Impairment Charges                   (192)   (1)  
Severance Costs   (102)               (102) (2) (39)  
Tax Act     (1)     (15)       (1) (15)    
Total   (103) (3) (181) (23) (20) (5) (6) (4) (310) (35)    
Duke Energy Carolinas [Member] | Regulatory settlements [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Utilities Operating Expense, Impairments       (179) (19)         (198)      
Progress Energy [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Costs to achieve mergers, integration costs   (2) (1) (3) (4) (6) (6) (7) (4) (10) (23)    
Asset Impairment Charges                   (87) (156) (7)  
Severance Costs   (69)               (69) (2) (40)  
Income (Loss) From Discontinued Operations, net of tax                       2  
Tax Act   (19) (5)   (1) 246       (25) 246    
Total   (150) (6) (3) (72) 217 (141) (7) (4) (231) 65    
Progress Energy [Member] | Regulatory Impairments [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Asset Impairment Charges   (60)               (60)      
Progress Energy [Member] | Regulatory settlements [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Utilities Operating Expense, Impairments         (67) (23) (135)     (67) (158)    
Duke Energy Progress [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Costs to achieve mergers, integration costs   (1) (1) (2) (2) (4) (4) (4) (2) (6) (14)    
Asset Impairment Charges                   (33) (19) (1)  
Severance Costs   (52)               (52) (1) (23)  
Tax Act   (15) (4)     40       (19) 40    
Total   (68) (5) (2) (69) 13 (4) (4) (2) (144) 3    
Duke Energy Progress [Member] | Regulatory settlements [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Utilities Operating Expense, Impairments         (67) (23)       (67) (23)    
Duke Energy Florida [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Costs to achieve mergers, integration costs   (1)   (1) (2) (2) (2) (3) (2) (4) (9)    
Asset Impairment Charges                   (54) (138) (6)  
Severance Costs   (17)               (17) (1) (17)  
Tax Act   2 (2)     226         226    
Total   (76) (2) (1) (2) 224 (137) (3) (2) (81) 82    
Duke Energy Florida [Member] | Regulatory Impairments [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Asset Impairment Charges   (60)               (60)      
Duke Energy Florida [Member] | Regulatory settlements [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Utilities Operating Expense, Impairments             (135)       (135)    
Duke Energy Ohio [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Costs to achieve mergers, integration costs   (6)   (5) (3) (2) (2) (1) (1) (14) (6)    
Asset Impairment Charges                     (1)    
Sale of Retired Plant         (107)         (107)      
Severance Costs   (6)               (6)   (3)  
Income (Loss) From Discontinued Operations, net of tax             (1)       (1) 36  
Tax Act   (2)       23       (2) 23    
Total   (14)   (5) (110) 21 (2) (1) (1) (129) 17    
Duke Energy Indiana [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Costs to achieve mergers, integration costs     (2)     (1) (2) (2) (1) (2) (6)    
Asset Impairment Charges                   (30) (18) (8)  
Severance Costs   (7)               (7) (1) $ (7)  
Tax Act           (55)         (55)    
Total   (7) (2)     (56) (2) (2) (1) (9) (61)    
Piedmont Natural Gas [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Costs to achieve mergers, integration costs   (22) (11) (9) (6) (19) (8) (13) (6) (48) (46)    
Asset Impairment Charges                     (7)    
Severance Costs $ (3) (2)               (2) (9)   $ (19)
Tax Act                     12    
Total   $ (24) $ (11) $ (9) $ (6) (17) $ (8) $ (13) $ (6) $ (50) (44)    
Piedmont Natural Gas [Member] | Impacts of the Tax Act [Member]                          
Quarterly Financial Information Disclosure [Line Items]                          
Tax Act           $ 2         $ 2