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Regulatory Matters (Schedule Of Regulatory Assets And Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Total Non-Current Regulatory Assets 3,672 3,135
Total Non-Current Regulatory Liabilities 2,919 2,876
Duke Energy Corp [Member]
    
Regulatory Assets 4,046 3,390
Total Non-Current Regulatory Assets 3,672 3,135
Regulatory Liabilities 3,006 3,155
Total Non-Current Regulatory Liabilities 2,919 2,876
Duke Energy Carolinas [Member]
    
Regulatory Assets 2,066 1,712
Total Non-Current Regulatory Assets 1,894 1,576
Regulatory Liabilities 1,990 2,187
Total Non-Current Regulatory Liabilities 1,928 1,940
Duke Energy Ohio [Member]
    
Regulatory Assets 548 460
Total Non-Current Regulatory Assets 520 440
Regulatory Liabilities 295 295
Total Non-Current Regulatory Liabilities 273 265
Duke Energy Indiana [Member]
    
Regulatory Assets 912 751
Total Non-Current Regulatory Assets 798 710
Regulatory Liabilities 686 653
Total Non-Current Regulatory Liabilities 683 651
Regulatory Current Asset [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 374  
Regulatory Current Asset [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 172  
Regulatory Current Asset [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 28  
Regulatory Current Asset [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 114  
Regulatory Current Asset [Member] | Duke Energy Corp [Member]
    
Regulatory Assets   255 [1]
Regulatory Current Asset [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets   136 [1]
Regulatory Current Asset [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets   20 [1]
Regulatory Current Asset [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets   41 [1]
Regulatory Current Asset [Member] | Gasification Services Agreement Buyout Costs [Member]
    
Recovery/Refund Period Ends 2012  
Regulatory Current Asset [Member] | Gasification Services Agreement Buyout Costs [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 25  
Regulatory Current Asset [Member] | Gasification Services Agreement Buyout Costs [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 25  
Regulatory Current Asset [Member] | Vacation Accrual [Member]
    
Recovery/Refund Period Ends 2012 2011 [2]
Regulatory Current Asset [Member] | Vacation Accrual [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 150 146 [2]
Regulatory Current Asset [Member] | Vacation Accrual [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 70 67 [2]
Regulatory Current Asset [Member] | Vacation Accrual [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 7 8 [2]
Regulatory Current Asset [Member] | Vacation Accrual [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 13 13 [2]
Regulatory Current Asset [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member]
    
Recovery/Refund Period Ends 2012  
Regulatory Current Asset [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 31  
Regulatory Current Asset [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 28  
Regulatory Current Asset [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 3  
Regulatory Current Asset [Member] | Hedge Costs And Other Deferrals [Member]
    
Recovery/Refund Period Ends 2012  
Regulatory Current Asset [Member] | Hedge Costs And Other Deferrals [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 4  
Regulatory Current Asset [Member] | Hedge Costs And Other Deferrals [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 3  
Regulatory Current Asset [Member] | Hedge Costs And Other Deferrals [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 1  
Regulatory Current Asset [Member] | Regional Transmission Organization [Member]
    
Recovery/Refund Period Ends 2012  
Regulatory Current Asset [Member] | Regional Transmission Organization [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 17  
Regulatory Current Asset [Member] | Regional Transmission Organization [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 5  
Regulatory Current Asset [Member] | Regional Transmission Organization [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 12  
Regulatory Current Asset [Member] | Under-Recovery Of Fuel Costs [Member]
    
Recovery/Refund Period Ends 2012 2011 [2]
Regulatory Current Asset [Member] | Under-Recovery Of Fuel Costs [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 38 31 [2]
Regulatory Current Asset [Member] | Under-Recovery Of Fuel Costs [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 10 12 [2]
Regulatory Current Asset [Member] | Under-Recovery Of Fuel Costs [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 28 19 [2]
Regulatory Current Asset [Member] | Allen Steam Station/Saluda River Deferrals [Member]
    
Recovery/Refund Period Ends   2011 [2],[3],[4]
Regulatory Current Asset [Member] | Allen Steam Station/Saluda River Deferrals [Member] | Duke Energy Corp [Member]
    
Regulatory Assets   28 [2],[3],[4]
Regulatory Current Asset [Member] | Allen Steam Station/Saluda River Deferrals [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets   28 [2],[3],[4]
Regulatory Current Asset [Member] | Over-Distribution Of Bulk Power Marketing Sharing [Member]
    
Recovery/Refund Period Ends 2012 2011
Regulatory Current Asset [Member] | Over-Distribution Of Bulk Power Marketing Sharing [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 41 35
Regulatory Current Asset [Member] | Over-Distribution Of Bulk Power Marketing Sharing [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 41 35
Regulatory Current Asset [Member] | DSM Cost/Save-A-Watt [Member]
    
Recovery/Refund Period Ends 2012  
Regulatory Current Asset [Member] | DSM Cost/Save-A-Watt [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 43  
Regulatory Current Asset [Member] | DSM Cost/Save-A-Watt [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 25  
Regulatory Current Asset [Member] | DSM Cost/Save-A-Watt [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 18  
Regulatory Current Asset [Member] | Smart Grid [Member]
    
Recovery/Refund Period Ends 2012  
Regulatory Current Asset [Member] | Smart Grid [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 9  
Regulatory Current Asset [Member] | Smart Grid [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 9  
Regulatory Current Asset [Member] | Other Regulatory Assets [Member]
    
Recovery/Refund Period Ends 2012 2011
Regulatory Current Asset [Member] | Other Regulatory Assets [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 16 15
Regulatory Current Asset [Member] | Other Regulatory Assets [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets   6
Regulatory Current Asset [Member] | Other Regulatory Assets [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 1  
Regulatory Current Asset [Member] | Other Regulatory Assets [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 15 9
Regulatory Noncurrent Asset [Member] | Net Regulatory Asset Related To Income Taxes [Member]
    
Recovery/Refund Period Ends (h [5] (h [6]
Regulatory Noncurrent Asset [Member] | Net Regulatory Asset Related To Income Taxes [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 892 [5] 780 [6]
Regulatory Noncurrent Asset [Member] | Net Regulatory Asset Related To Income Taxes [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 668 [5] 601 [6]
Regulatory Noncurrent Asset [Member] | Net Regulatory Asset Related To Income Taxes [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 77 [5] 78 [6]
Regulatory Noncurrent Asset [Member] | Net Regulatory Asset Related To Income Taxes [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 147 [5] 101 [6]
Regulatory Noncurrent Asset [Member] | Accrued Pension And Post Retirement [Member]
    
Recovery/Refund Period Ends (b [7] (b [6]
Regulatory Noncurrent Asset [Member] | Accrued Pension And Post Retirement [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 1,726 [7] 1,616 [6]
Regulatory Noncurrent Asset [Member] | Accrued Pension And Post Retirement [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 734 [7] 680 [6]
Regulatory Noncurrent Asset [Member] | Accrued Pension And Post Retirement [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 212 [7] 211 [6]
Regulatory Noncurrent Asset [Member] | Accrued Pension And Post Retirement [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 314 [7] 316 [6]
Regulatory Noncurrent Asset [Member] | ARO Costs And NDTF Assets [Member]
    
Recovery/Refund Period Ends 2043 2043 [6]
Regulatory Noncurrent Asset [Member] | ARO Costs And NDTF Assets [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 191 133 [6]
Regulatory Noncurrent Asset [Member] | ARO Costs And NDTF Assets [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 191 133 [6]
Regulatory Noncurrent Asset [Member] | Regulatory Transition Charges [Member]
    
Recovery/Refund Period Ends (b [7] 2011 [6]
Regulatory Noncurrent Asset [Member] | Regulatory Transition Charges [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 80 [7] 3 [6]
Regulatory Noncurrent Asset [Member] | Regulatory Transition Charges [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 13 [7]  
Regulatory Noncurrent Asset [Member] | Regulatory Transition Charges [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 74 [7] 3 [6]
Regulatory Noncurrent Asset [Member] | Gasification Services Agreement Buyout Costs [Member]
    
Recovery/Refund Period Ends 2018 2018 [6]
Regulatory Noncurrent Asset [Member] | Gasification Services Agreement Buyout Costs [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 88 129 [6]
Regulatory Noncurrent Asset [Member] | Gasification Services Agreement Buyout Costs [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 88 129 [6]
Regulatory Noncurrent Asset [Member] | Deferred Debt Expense [Member]
    
Recovery/Refund Period Ends 2041 2040 [6]
Regulatory Noncurrent Asset [Member] | Deferred Debt Expense [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 122 138 [6]
Regulatory Noncurrent Asset [Member] | Deferred Debt Expense [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 98 108 [6]
Regulatory Noncurrent Asset [Member] | Deferred Debt Expense [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 8 9 [6]
Regulatory Noncurrent Asset [Member] | Deferred Debt Expense [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 16 21 [6]
Regulatory Noncurrent Asset [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member]
    
Recovery/Refund Period Ends (h [5] (h [1],[3],[6]
Regulatory Noncurrent Asset [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 119 [5] 103 [1],[3],[6]
Regulatory Noncurrent Asset [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 31 [5] 11 [1],[3],[6]
Regulatory Noncurrent Asset [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 16 [5] 11 [1],[3],[6]
Regulatory Noncurrent Asset [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 72 [5] 81 [1],[3],[6]
Regulatory Noncurrent Asset [Member] | Hedge Costs And Other Deferrals [Member]
    
Recovery/Refund Period Ends (b [7] (b [6]
Regulatory Noncurrent Asset [Member] | Hedge Costs And Other Deferrals [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 166 [7] 6 [6]
Regulatory Noncurrent Asset [Member] | Hedge Costs And Other Deferrals [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 91 [7]  
Regulatory Noncurrent Asset [Member] | Hedge Costs And Other Deferrals [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 8 [7] 6 [6]
Regulatory Noncurrent Asset [Member] | Hedge Costs And Other Deferrals [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 67 [7]  
Regulatory Noncurrent Asset [Member] | Under-Recovery Of Fuel Costs [Member]
    
Recovery/Refund Period Ends 2013 2012 [6]
Regulatory Noncurrent Asset [Member] | Under-Recovery Of Fuel Costs [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 13 21 [6]
Regulatory Noncurrent Asset [Member] | Under-Recovery Of Fuel Costs [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 13 20 [6]
Regulatory Noncurrent Asset [Member] | Under-Recovery Of Fuel Costs [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets   1 [6]
Regulatory Noncurrent Asset [Member] | Storm Cost Deferrals [Member]
    
Recovery/Refund Period Ends (b [7] (b [6]
Regulatory Noncurrent Asset [Member] | Storm Cost Deferrals [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 18 [7] 33 [6]
Regulatory Noncurrent Asset [Member] | Storm Cost Deferrals [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 18 [7] 21 [6]
Regulatory Noncurrent Asset [Member] | Storm Cost Deferrals [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets   12 [6]
Regulatory Noncurrent Asset [Member] | DSM Cost/Save-A-Watt [Member]
    
Recovery/Refund Period Ends (b [7]  
Regulatory Noncurrent Asset [Member] | DSM Cost/Save-A-Watt [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 38 [7]  
Regulatory Noncurrent Asset [Member] | DSM Cost/Save-A-Watt [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 38 [7]  
Regulatory Noncurrent Asset [Member] | Midwest ISO Costs [Member]
    
Recovery/Refund Period Ends   (b [6],[8]
Regulatory Noncurrent Asset [Member] | Midwest ISO Costs [Member] | Duke Energy Corp [Member]
    
Regulatory Assets   7 [6],[8]
Regulatory Noncurrent Asset [Member] | Midwest ISO Costs [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets   7 [6],[8]
Regulatory Noncurrent Asset [Member] | Manufactured Gas Plant Environmental Reserve [Member]
    
Recovery/Refund Period Ends (b [7] (b [6]
Regulatory Noncurrent Asset [Member] | Manufactured Gas Plant Environmental Reserve [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 69 [7] 60 [6]
Regulatory Noncurrent Asset [Member] | Manufactured Gas Plant Environmental Reserve [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 69 [7] 60 [6]
Regulatory Noncurrent Asset [Member] | Smart Grid [Member]
    
Recovery/Refund Period Ends (b [7] (b [6]
Regulatory Noncurrent Asset [Member] | Smart Grid [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 32 [7] 28 [6]
Regulatory Noncurrent Asset [Member] | Smart Grid [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 32 [7] 28 [6]
Regulatory Noncurrent Asset [Member] | Gallagher Units 1 & 3 [Member]
    
Recovery/Refund Period Ends (b [7]  
Regulatory Noncurrent Asset [Member] | Gallagher Units 1 & 3 [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 73 [7]  
Regulatory Noncurrent Asset [Member] | Gallagher Units 1 & 3 [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 73 [7]  
Regulatory Noncurrent Asset [Member] | Other Regulatory Assets [Member]
    
Recovery/Refund Period Ends (b [7] (b
Regulatory Noncurrent Asset [Member] | Other Regulatory Assets [Member] | Duke Energy Corp [Member]
    
Regulatory Assets 45 [7] 78
Regulatory Noncurrent Asset [Member] | Other Regulatory Assets [Member] | Duke Energy Carolinas [Member]
    
Regulatory Assets 17 [7] 23
Regulatory Noncurrent Asset [Member] | Other Regulatory Assets [Member] | Duke Energy Ohio [Member]
    
Regulatory Assets 6 [7] 5
Regulatory Noncurrent Asset [Member] | Other Regulatory Assets [Member] | Duke Energy Indiana [Member]
    
Regulatory Assets 21 [7] 50
Regulatory Current Liabilities [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 87 279 [2],[9]
Regulatory Current Liabilities [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities 62 247 [2],[9]
Regulatory Current Liabilities [Member] | Duke Energy Ohio [Member]
    
Regulatory Liabilities 22 30 [2],[9]
Regulatory Current Liabilities [Member] | Duke Energy Indiana [Member]
    
Regulatory Liabilities 3 2 [2],[9]
Regulatory Current Liabilities [Member] | Nuclear Property And Liability Reserves [Member]
    
Recovery/Refund Period Ends 2012 2011 [2]
Regulatory Current Liabilities [Member] | Nuclear Property And Liability Reserves [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 2 52 [2]
Regulatory Current Liabilities [Member] | Nuclear Property And Liability Reserves [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities 2 52 [2]
Regulatory Current Liabilities [Member] | Demand-Side Management Costs [Member]
    
Recovery/Refund Period Ends 2012 (i [10],[2]
Regulatory Current Liabilities [Member] | Demand-Side Management Costs [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 41 38 [10],[2]
Regulatory Current Liabilities [Member] | Demand-Side Management Costs [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities 41 38 [10],[2]
Regulatory Current Liabilities [Member] | Gas Purchase Costs [Member]
    
Recovery/Refund Period Ends 2012 2011 [2]
Regulatory Current Liabilities [Member] | Gas Purchase Costs [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 20 25 [2]
Regulatory Current Liabilities [Member] | Gas Purchase Costs [Member] | Duke Energy Ohio [Member]
    
Regulatory Liabilities 20 25 [2]
Regulatory Current Liabilities [Member] | Over-Recovery Of Fuel Costs [Member]
    
Recovery/Refund Period Ends 2012 2011 [10],[2]
Regulatory Current Liabilities [Member] | Over-Recovery Of Fuel Costs [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 6 155 [10],[2]
Regulatory Current Liabilities [Member] | Over-Recovery Of Fuel Costs [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities 6 152 [10],[2]
Regulatory Current Liabilities [Member] | Over-Recovery Of Fuel Costs [Member] | Duke Energy Ohio [Member]
    
Regulatory Liabilities   3 [10],[2]
Regulatory Current Liabilities [Member] | Other Regulatory Liabilities [Member]
    
Recovery/Refund Period Ends 2012 (b [2]
Regulatory Current Liabilities [Member] | Other Regulatory Liabilities [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 18 9 [2]
Regulatory Current Liabilities [Member] | Other Regulatory Liabilities [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities 13 5 [2]
Regulatory Current Liabilities [Member] | Other Regulatory Liabilities [Member] | Duke Energy Ohio [Member]
    
Regulatory Liabilities 2 2 [2]
Regulatory Current Liabilities [Member] | Other Regulatory Liabilities [Member] | Duke Energy Indiana [Member]
    
Regulatory Liabilities 3 2 [2]
Regulatory Noncurrent Liabilities [Member] | Removal Costs [Member]
    
Recovery/Refund Period Ends (j [11] (j [6]
Regulatory Noncurrent Liabilities [Member] | Removal Costs [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 2,586 [11] 2,465 [6]
Regulatory Noncurrent Liabilities [Member] | Removal Costs [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities 1,770 [11] 1,684 [6]
Regulatory Noncurrent Liabilities [Member] | Removal Costs [Member] | Duke Energy Ohio [Member]
    
Regulatory Liabilities 230 [11] 220 [6]
Regulatory Noncurrent Liabilities [Member] | Removal Costs [Member] | Duke Energy Indiana [Member]
    
Regulatory Liabilities 590 [11] 565 [6]
Regulatory Noncurrent Liabilities [Member] | Nuclear Property And Liability Reserves [Member]
    
Recovery/Refund Period Ends 2043 2043 [6]
Regulatory Noncurrent Liabilities [Member] | Nuclear Property And Liability Reserves [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 86 89 [6]
Regulatory Noncurrent Liabilities [Member] | Nuclear Property And Liability Reserves [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities 86 89 [6]
Regulatory Noncurrent Liabilities [Member] | Demand-Side Management Costs [Member]
    
Recovery/Refund Period Ends (i [4] (i [10],[6]
Regulatory Noncurrent Liabilities [Member] | Demand-Side Management Costs [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 27 [4] 57 [10],[6]
Regulatory Noncurrent Liabilities [Member] | Demand-Side Management Costs [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities 10 [4] 52 [10],[6]
Regulatory Noncurrent Liabilities [Member] | Demand-Side Management Costs [Member] | Duke Energy Ohio [Member]
    
Regulatory Liabilities 17 [4] 5 [10],[6]
Regulatory Noncurrent Liabilities [Member] | Accrued Pension And Post Retirement [Member]
    
Recovery/Refund Period Ends (b [7] (b [6]
Regulatory Noncurrent Liabilities [Member] | Accrued Pension And Post Retirement [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 117 [7] 88 [6]
Regulatory Noncurrent Liabilities [Member] | Accrued Pension And Post Retirement [Member] | Duke Energy Ohio [Member]
    
Regulatory Liabilities 19 [7] 20 [6]
Regulatory Noncurrent Liabilities [Member] | Accrued Pension And Post Retirement [Member] | Duke Energy Indiana [Member]
    
Regulatory Liabilities 70 [7] 58 [6]
Regulatory Noncurrent Liabilities [Member] | Commodity Contract Termination Settlement [Member]
    
Recovery/Refund Period Ends 2014 2014 [6]
Regulatory Noncurrent Liabilities [Member] | Commodity Contract Termination Settlement [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 23 28 [6]
Regulatory Noncurrent Liabilities [Member] | Commodity Contract Termination Settlement [Member] | Duke Energy Indiana [Member]
    
Regulatory Liabilities 23 28 [6]
Regulatory Noncurrent Liabilities [Member] | Injuries And Damages Reserve [Member]
    
Recovery/Refund Period Ends (b [7] (b [6]
Regulatory Noncurrent Liabilities [Member] | Injuries And Damages Reserve [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 38 [7] 38 [6]
Regulatory Noncurrent Liabilities [Member] | Injuries And Damages Reserve [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities 38 [7] 38 [6]
Regulatory Noncurrent Liabilities [Member] | Hedge Costs And Other Deferrals [Member]
    
Recovery/Refund Period Ends 2016 2042 [6]
Regulatory Noncurrent Liabilities [Member] | Hedge Costs And Other Deferrals [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 12 75 [6]
Regulatory Noncurrent Liabilities [Member] | Hedge Costs And Other Deferrals [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities   60 [6]
Regulatory Noncurrent Liabilities [Member] | Hedge Costs And Other Deferrals [Member] | Duke Energy Ohio [Member]
    
Regulatory Liabilities   1 [6]
Regulatory Noncurrent Liabilities [Member] | Other Regulatory Liabilities [Member]
    
Recovery/Refund Period Ends (b [7] (b
Regulatory Noncurrent Liabilities [Member] | Other Regulatory Liabilities [Member] | Duke Energy Corp [Member]
    
Regulatory Liabilities 30 [7] 36
Regulatory Noncurrent Liabilities [Member] | Other Regulatory Liabilities [Member] | Duke Energy Carolinas [Member]
    
Regulatory Liabilities 24 [7] 17
Regulatory Noncurrent Liabilities [Member] | Other Regulatory Liabilities [Member] | Duke Energy Ohio [Member]
    
Regulatory Liabilities 7 [7] 19
[1] Included in Other within Current Assets on the Consolidated Balance Sheets.
[2] All regulatory assets and liabilities are excluded from rate base unless otherwise noted.
[3] Duke Energy Carolinas is allowed to earn a return on the North Carolina portion of the outstanding balance. Duke Energy Carolinas does not earn a return on the South Carolina portion during the refund period.
[4] Incurred costs were deferred and are being recovered in rates. Duke Energy Carolinas is currently over-recovered for these costs in the South Carolina jurisdiction. For 2011 and 2010, expected refund period is three years and two years, respectively, but is dependent on volume of sales.
[5] Recovery is over the life of the associated asset.
[6] Included in rate base.
[7] Recovery/Refund period varies for these items with some currently unknown.
[8] Duke Energy Carolinas RTO costs reflect those from GridSouth, while those from Duke Energy Ohio and Duke Energy Indiana are related to the Midwest Independent Transmission System Operator, Inc. (Midwest ISO).
[9] Included in Other within Current Liabilities and on the Consolidated Balance Sheets.
[10] Duke Energy Carolinas is required to pay interest on the outstanding balance.
[11] Liability is extinguished over the lives of the associated assets.