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Business Segments (Business Segment Data) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues $ 5,898 $ 3,630  
Operating revenues 5,898 3,630  
Segment income 634 293  
Add back Noncontrolling interest component 0 4  
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 0 2  
Net Income (Loss) 634 299  
Segment Reporting Information Assets [Abstract]      
Segment assets 113,666   113,856
U S Franchised Electric And Gas [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 5,052 2,660 [1]  
Intersegment Revenues 8 8  
Segment Reporting Information, Revenue for Reportable Segment, Total 5,060 2,668  
Segment income 656 136 [1],[2]  
Segments Notes To Tables [Abstract]      
After-tax deferral of voluntary severance program expense   60  
Deferral of voluntary severance program expense, tax   39  
Segment Reporting Information Assets [Abstract]      
Segment assets 98,419    
U S Franchised Electric And Gas [Member] | Edwardsport IGCC Plant [Member]
      
Segments Notes To Tables [Abstract]      
After-tax impairment charge   268  
Impairment charge, tax   152  
U S Franchised Electric And Gas [Member] | North Carolina Rate Case [Member]
      
Segments Notes To Tables [Abstract]      
Approved rate increase amount by state commission   309  
U S Franchised Electric And Gas [Member] | South Carolina Rate Case [Member]
      
Segments Notes To Tables [Abstract]      
Approved rate increase amount by state commission   93  
Commercial Power [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 439 564  
Intersegment Revenues 13 16  
Segment Reporting Information, Revenue for Reportable Segment, Total 452 580  
Segment income (42) 31  
Segment Reporting Information Assets [Abstract]      
Segment assets 6,937    
International Energy [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 392 402  
Segment Reporting Information, Revenue for Reportable Segment, Total 392 402  
Segment income 97 142  
Segment Reporting Information Assets [Abstract]      
Segment assets 5,521    
Total Reportable Segments [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 5,883 3,626  
Intersegment Revenues 21 24  
Segment Reporting Information, Revenue for Reportable Segment, Total 5,904 3,650  
Segment income 711 309  
Segment Reporting Information Assets [Abstract]      
Segment assets 110,877    
All Other Segments [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 15 4  
Intersegment Revenues 20 11  
Segment Reporting Information, Revenue for Reportable Segment, Total 35 15  
Segment income (77) [3] (16)  
Segments Notes To Tables [Abstract]      
After-tax costs to achieve the merger 34    
Costs to achieve the merger, tax 21    
Segment Reporting Information Assets [Abstract]      
Segment assets 2,696    
Intersegment Eliminations [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Intersegment Revenues (41) (35)  
Segment Reporting Information, Revenue for Reportable Segment, Total (41) (35)  
Segment Reporting Information Assets [Abstract]      
Segment assets 93    
Duke Energy Carolinas [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Operating revenues 1,729 1,501  
Net Income (Loss) 244 266  
Segment Reporting Information Assets [Abstract]      
Segment assets 30,927   30,642
Duke Energy Carolinas [Member] | All Other Segments [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment income (19) (8)  
Progress Energy [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 2,178 2,102  
Intersegment Revenues 8    
Operating revenues 2,186 2,102  
Segment income 153 139  
Add back Noncontrolling interest component 1 2  
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 0 11  
Net Income (Loss) 154 152  
Segment Reporting Information Assets [Abstract]      
Segment assets 37,285   37,405
Progress Energy [Member] | Total Reportable Segments [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 2,169 2,099  
Intersegment Revenues 9 1  
Segment Reporting Information, Revenue for Reportable Segment, Total 2,178 2,100  
Segment income 232 178  
Segment Reporting Information Assets [Abstract]      
Segment assets 36,786    
Progress Energy [Member] | All Other Segments [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 9 3  
Segment Reporting Information, Revenue for Reportable Segment, Total 9 3  
Segment income (79) [4] (39) [5]  
Segments Notes To Tables [Abstract]      
After-tax costs to achieve the merger 12 4  
Costs to achieve the merger, tax 8 3  
Segment Reporting Information Assets [Abstract]      
Segment assets 520    
Progress Energy [Member] | Intersegment Eliminations [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Intersegment Revenues (1) (1)  
Segment Reporting Information, Revenue for Reportable Segment, Total (1) (1)  
Segment Reporting Information Assets [Abstract]      
Segment assets (21)    
Progress Energy [Member] | Franchised Electric [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 2,169 2,099  
Intersegment Revenues 9 1  
Segment Reporting Information, Revenue for Reportable Segment, Total 2,178 2,100  
Segment income 232 178  
Segment Reporting Information Assets [Abstract]      
Segment assets 36,786    
Duke Energy Progress [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Operating revenues 1,216 1,090  
Net Income (Loss) 110 52  
Segment Reporting Information Assets [Abstract]      
Segment assets 18,246   18,068
Duke Energy Progress [Member] | All Other Segments [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment income (7) (3)  
Duke Energy Florida [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Operating revenues 968 1,010  
Net Income (Loss) 110 128  
Segment Reporting Information Assets [Abstract]      
Segment assets 14,985   15,180
Duke Energy Florida [Member] | All Other Segments [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment income (5) (1)  
Duke Energy Ohio [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 747 912  
Operating revenues 747 912  
Segment income (21) 74  
Net Income (Loss) (21) 74  
Segment Reporting Information Assets [Abstract]      
Segment assets 10,583   10,560
Duke Energy Ohio [Member] | Total Reportable Segments [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 747 912  
Intersegment Revenues 11 15  
Segment Reporting Information, Revenue for Reportable Segment, Total 758 927  
Segment income (14) 78  
Segment Reporting Information Assets [Abstract]      
Segment assets 10,634    
Duke Energy Ohio [Member] | All Other Segments [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment income (7) (4)  
Segment Reporting Information Assets [Abstract]      
Segment assets 109    
Duke Energy Ohio [Member] | Intersegment Eliminations [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 0 0  
Intersegment Revenues (11) (15)  
Segment Reporting Information, Revenue for Reportable Segment, Total (11) (15)  
Segment Reporting Information Assets [Abstract]      
Segment assets (160)    
Duke Energy Ohio [Member] | DEO Commercial Power [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 255 439  
Intersegment Revenues 11 15  
Segment Reporting Information, Revenue for Reportable Segment, Total 266 454  
Segment income (67) 44  
Segment Reporting Information Assets [Abstract]      
Segment assets 4,120    
Duke Energy Ohio [Member] | Franchised Electric & Gas [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Unaffiliated Revenues 492 473  
Intersegment Revenues 0    
Segment Reporting Information, Revenue for Reportable Segment, Total 492 473  
Segment income 53 34  
Segment Reporting Information Assets [Abstract]      
Segment assets 6,514    
Duke Energy Indiana [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Operating revenues 724 688  
Net Income (Loss) 90 (167)  
Segment Reporting Information Assets [Abstract]      
Segment assets 10,060   10,008
Duke Energy Indiana [Member] | All Other Segments [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Segment income $ (4) $ (4)  
[1] On January 25, 2012 and January 27, 2012, the Duke Energy Carolinas' South Carolina and North Carolina rate case settlement agreements were approved by the PSCSC and NCUC, respectively. Among other things, the rate case settlements included an annual base rate increase of $309 million in North Carolina and a $93 million annual base rate increase in South Carolina, both beginning in February 2012. The impact of these rates impacts USFE&G.
[2] USFE&G recorded an after-tax impairment charge of $268 million, net of tax of $152 million, related to Duke Energy Indiana's Edwardsport Integrated Gasification Combined Cycle (IGCC) project. USFE&G also recorded the reversal of expenses of $60 million, net of tax of $39 million, related to a prior year Voluntary Opportunity Plan in accordance with Duke Energy Carolinas' 2011 rate case.
[3] Other includes after-tax costs to achieve the merger with Progress Energy of $34 million, net of tax of $21 million. See Note 2 for additional information.
[4] Other includes after-tax costs to achieve the merger with Duke Energy of $12 million, net of tax of $8 million. See Note 2 for additional information.
[5] Other includes after-tax costs to achieve the merger with Duke Energy of $4 million, net of tax of $3 million. See Note 2 for additional information.