v2.4.0.8
Business Segments (Business Segment Data) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues $ 6,395 $ 6,217 $ 18,366 $ 17,132  
Segment income 888 942 2,356 1,890  
Add back noncontrolling interests component 3 4 11 12  
Income (Loss) From Discontinued Operations, net of tax 378 62 (578) 82  
Net Income (Loss) Attributable to Parent 1,274 1,004 1,786 1,977  
Net income (loss) 1,269 1,008 1,789 1,984  
Segment assets 119,656   119,656   114,779
Impairment charges 1 2 81 388  
Regulated Utilities [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 5,975 5,768 [1] 17,041 15,731 [1],[2],[3],[4]  
Segment income 920 923 [1] 2,346 1,932 [1],[2],[3],[4],[5]  
International Energy [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 366 370 1,111 1,168  
Segment income 80 116 356 300  
Commercial Power [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 50 56 195 184  
Segment income (17) (28) (70) [6] (54)  
Other [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 4 23 19 49  
Segment income (92) [7] (64) [7] (269) [7] (278) [7]  
Total Reportable Segments [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 6,391 6,194 18,347 17,083  
Segment income 983 1,011 2,632 2,178  
Operating Segments [Member] | Regulated Utilities [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 5,986 5,786 17,074 15,766  
Segment assets 105,172   105,172    
Operating Segments [Member] | International Energy [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 366 370 1,111 1,168  
Segment assets 5,159   5,159    
Operating Segments [Member] | Commercial Power [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 50 58 195 189  
Segment assets 6,196   6,196    
Operating Segments [Member] | Total Reportable Segments [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 6,402 6,214 18,380 17,123  
Segment assets 116,527   116,527    
Intersegment Eliminations [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues (32) (44) (93) (104)  
Segment income (3) (5) (7) (10)  
Segment assets (185)   (185)    
Intersegment Eliminations [Member] | Regulated Utilities [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues (11) (18) (33) (35)  
Intersegment Eliminations [Member] | Commercial Power [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues   (2)   (5)  
Intersegment Eliminations [Member] | Other [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues (21) (24) (60) (64)  
Intersegment Eliminations [Member] | Total Reportable Segments [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues (11) (20) (33) (40)  
Corporate, Non-Segment [Member] | Other [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 25 47 79 113  
Segment assets 2,944   2,944    
Other VIEs [Member] | Commercial Power [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Impairment charges     94    
Duke Energy Ohio [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 446 438 1,433 1,349  
Segment income 26 24 39 57  
Income (Loss) From Discontinued Operations, net of tax 413 35 (597) 39  
Net Income (Loss) Attributable to Parent 439 59 (558) 96  
Segment assets 10,072   10,072   10,763
Impairment charges       94     
Duke Energy Ohio [Member] | Regulated Utilities [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 440 421 1,416 1,317  
Segment income 43 42 151 122  
Duke Energy Ohio [Member] | Commercial Power [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 6 17 17 32  
Segment income (13) (13) (101) [8] (51)  
Duke Energy Ohio [Member] | Other [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment income (4) (5) (11) (14)  
Duke Energy Ohio [Member] | Total Reportable Segments [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 446 438 1,433 1,349  
Segment income 30 29 50 71  
Duke Energy Ohio [Member] | Operating Segments [Member] | Regulated Utilities [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 441 421 1,417 1,317  
Segment assets 7,297   7,297    
Duke Energy Ohio [Member] | Operating Segments [Member] | Commercial Power [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 6 17 17 32  
Segment assets 3,266   3,266    
Duke Energy Ohio [Member] | Operating Segments [Member] | Total Reportable Segments [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues 447 438 1,434 1,349  
Segment assets 10,563   10,563    
Duke Energy Ohio [Member] | Intersegment Eliminations [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues (1)   (1)     
Segment assets (622)   (622)    
Duke Energy Ohio [Member] | Intersegment Eliminations [Member] | Regulated Utilities [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues (1)   (1)    
Duke Energy Ohio [Member] | Intersegment Eliminations [Member] | Total Reportable Segments [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating revenues (1)   (1)    
Duke Energy Ohio [Member] | Corporate, Non-Segment [Member] | Other [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Segment assets 131   131    
Duke Energy Ohio [Member] | Other VIEs [Member] | Commercial Power [Member]
          
Segment Reporting Information, Profit (Loss) [Abstract]          
Impairment charges     $ 94    
[1] In September 2013, Duke Energy Carolinas implemented revised customer rates approved by the NCUC and the PSCSC. These rate increases impact Regulated Utilities.
[2] In June 2013, NCUC approved a Duke Energy Progress settlement agreement that included an increase in rates in the first year beginning in June 2013. This rate increase impacts Regulated Utilities.
[3] Regulated Utilities recorded an impairment charge related to Duke Energy Florida's Crystal River Unit 3. See Note 4 for additional information.
[4] In May 2013, the PUCO approved a Duke Energy Ohio settlement agreement that provides for a net annual increase in electric distribution revenues beginning in May 2013. This rate increase impacts Regulated Utilities.
[5] Regulated Utilities recorded an impairment charge related to the letter Duke Energy Progress filed with the NRC requesting the NRC to suspend its review activities associated with the combined construction and operating license (COL) at Harris site. Regulated Utilities also recorded an impairment charge related to the write-off of the wholesale portion of the Levy investments at Duke Energy Florida in accordance with the 2013 Settlement. See Note 4 for additional information.
[6] Commercial Power recorded a pretax impairment charge of $94 million related to reducing the carrying value of OVEC to zero. See Note 13 for additional information.
[7] Other includes costs to achieve the Progress Energy merger.
[8] Duke Energy Ohio recorded a pretax impairment charge of $94 million related to reducing the carrying value of OVEC to zero. See Note 13 for additional information.