v2.4.0.6
Risk Management, Derivative Instruments And Hedging Activities (Schedule Of Offsetting Assets and Liabilities: Derivatives and collateral posted) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset $ 309 $ 264
Derivative assets 75 [1] 103 [1]
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 845 917
Derivative liabilities 611 [2] 756 [2]
Other Current Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 182 127
Derivative asset, fair value, gross liability 157 114
Derivative asset, not subject to master netting arrangement 21 22
Other Current Assets [Member] | Gross Amounts Recognized [Member]
    
Derivative Assets Subject to Master Netting    
Derivative assets 203 149
Other Current Assets [Member] | Gross Amounts Offset [Member]
    
Derivative Assets Subject to Master Netting    
Derivative assets 157 114
Other Current Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 25 13
Derivative asset, not subject to master netting arrangement 21 22
Derivative assets 46 [3] 35 [3]
Other Noncurrent Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 91 96
Derivative asset, fair value, gross liability 75 54
Derivative asset, not subject to master netting arrangement 15 19
Other Noncurrent Assets [Member] | Gross Amounts Recognized [Member]
    
Derivative Assets Subject to Master Netting    
Derivative assets 106 115
Other Noncurrent Assets [Member] | Gross Amounts Offset [Member]
    
Derivative Assets Subject to Master Netting    
Derivative assets 75 54
Other Noncurrent Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 16 42
Derivative asset, not subject to master netting arrangement 15 19
Derivative assets 31 [4] 61 [4]
Other Current Liabilities [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 350 402
Derivative liability, fair value, gross asset 222 151
Derivative liability, not subject to master netting arrangement 159 166
Other Current Liabilities [Member] | Gross Amounts Recognized [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liabilities 509 568
Other Current Liabilities [Member] | Gross Amounts Offset [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liabilities 222 151
Other Current Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, net amounts included on the Consolidated Balance Sheets 128 251
Derivative liability, not subject to master netting arrangement 159 166
Derivative liabilities 287 [5] 417 [5]
Other Noncurrent Liabilities [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 295 295
Derivative liability, fair value, gross asset 118 90
Derivative liability, not subject to master netting arrangement 41 54
Other Noncurrent Liabilities [Member] | Gross Amounts Recognized [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liabilities 336 349
Other Noncurrent Liabilities [Member] | Gross Amounts Offset [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liabilities 118 90
Other Noncurrent Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, net amounts included on the Consolidated Balance Sheets 177 205
Derivative liability, not subject to master netting arrangement 41 54
Derivative liabilities 218 [6] 259 [6]
Duke Energy Carolinas [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 5 12
Derivative liabilities 5 [7] 12 [7]
Duke Energy Carolinas [Member] | Other Current Liabilities [Member] | Gross Amounts Recognized [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, not subject to master netting arrangement 2 6
Duke Energy Carolinas [Member] | Other Current Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, not subject to master netting arrangement 2 [5] 6 [5]
Duke Energy Carolinas [Member] | Other Noncurrent Liabilities [Member] | Gross Amounts Recognized [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, not subject to master netting arrangement 3 6
Duke Energy Carolinas [Member] | Other Noncurrent Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, not subject to master netting arrangement 3 [6] 6 [6]
Progress Energy [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 47 11
Derivative assets 15 [8] 11 [8]
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 301 440
Derivative liabilities 269 [9] 440 [9]
Progress Energy [Member] | Other Current Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 33 3
Derivative asset, fair value, gross liability 21  
Progress Energy [Member] | Other Current Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 12 [3] 3 [3]
Progress Energy [Member] | Other Noncurrent Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 14 8
Derivative asset, fair value, gross liability 12  
Progress Energy [Member] | Other Noncurrent Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 2 [4] 8 [4]
Progress Energy [Member] | Other Current Liabilities [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 141 244
Derivative liability, fair value, gross asset 34 22
Progress Energy [Member] | Other Current Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, net amounts included on the Consolidated Balance Sheets 107 [5] 222 [5]
Progress Energy [Member] | Other Noncurrent Liabilities [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 156 192
Derivative liability, fair value, gross asset 34 36
Derivative liability, not subject to master netting arrangement 4 4
Progress Energy [Member] | Other Noncurrent Liabilities [Member] | Gross Amounts Recognized [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liabilities 160 196
Progress Energy [Member] | Other Noncurrent Liabilities [Member] | Gross Amounts Offset [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liabilities 34 36
Progress Energy [Member] | Other Noncurrent Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, net amounts included on the Consolidated Balance Sheets 122 156
Derivative liability, not subject to master netting arrangement 4 4
Derivative liabilities 126 [6] 160 [6]
Duke Energy Progress [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 14 2
Derivative assets 5 [8] 2 [8]
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 108 166
Derivative liabilities 98 [10] 166 [10]
Duke Energy Progress [Member] | Other Current Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 12 1
Derivative asset, fair value, gross liability 8  
Duke Energy Progress [Member] | Other Current Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 4 [3] 1 [3]
Duke Energy Progress [Member] | Other Noncurrent Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 2 1
Derivative asset, fair value, gross liability 2  
Duke Energy Progress [Member] | Other Noncurrent Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 0 [4] 1 [4]
Duke Energy Progress [Member] | Other Current Liabilities [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 53 97
Derivative liability, fair value, gross asset 8 2
Duke Energy Progress [Member] | Other Current Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, net amounts included on the Consolidated Balance Sheets 45 [5] 95 [5]
Duke Energy Progress [Member] | Other Noncurrent Liabilities [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 55 69
Derivative liability, fair value, gross asset 5 7
Duke Energy Progress [Member] | Other Noncurrent Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, net amounts included on the Consolidated Balance Sheets 50 [6] 62 [6]
Duke Energy Florida [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 33 9
Derivative assets 10 [11] 9 [11]
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 190 270
Derivative liabilities 167 [12] 270 [12]
Duke Energy Florida [Member] | Other Current Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 21 2
Derivative asset, fair value, gross liability 13  
Duke Energy Florida [Member] | Other Current Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 8 [13] 2 [13]
Duke Energy Florida [Member] | Other Noncurrent Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 12 7
Derivative asset, fair value, gross liability 10  
Duke Energy Florida [Member] | Other Noncurrent Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 2 [14] 7 [14]
Duke Energy Florida [Member] | Other Current Liabilities [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 89 147
Derivative liability, fair value, gross asset 26 20
Duke Energy Florida [Member] | Other Current Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, net amounts included on the Consolidated Balance Sheets 63 [15] 127 [15]
Duke Energy Florida [Member] | Other Noncurrent Liabilities [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 101 123
Derivative liability, fair value, gross asset 29 29
Duke Energy Florida [Member] | Other Noncurrent Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, net amounts included on the Consolidated Balance Sheets 72 [16] 94 [16]
Duke Energy Ohio [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 244 220
Derivative assets 19 [17] 59 [17]
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 319 199
Derivative liabilities 94 [9] 38 [9]
Duke Energy Ohio [Member] | Other Current Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 172 137
Derivative asset, fair value, gross liability 163 110
Derivative asset, not subject to master netting arrangement 2 2
Duke Energy Ohio [Member] | Other Current Assets [Member] | Gross Amounts Recognized [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet   27
Derivative assets 174 139
Duke Energy Ohio [Member] | Other Current Assets [Member] | Gross Amounts Offset [Member]
    
Derivative Assets Subject to Master Netting    
Derivative assets 163 110
Duke Energy Ohio [Member] | Other Current Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 9  
Derivative asset, not subject to master netting arrangement 2 2
Derivative assets 11 [3] 29 [3]
Duke Energy Ohio [Member] | Other Noncurrent Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 70 81
Derivative asset, fair value, gross liability 63 51
Duke Energy Ohio [Member] | Other Noncurrent Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 7 [4] 30 [4]
Duke Energy Ohio [Member] | Other Current Liabilities [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 214 136
Derivative liability, fair value, gross asset 209 125
Derivative liability, not subject to master netting arrangement 1 1
Duke Energy Ohio [Member] | Other Current Liabilities [Member] | Gross Amounts Recognized [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liabilities 215 137
Duke Energy Ohio [Member] | Other Current Liabilities [Member] | Gross Amounts Offset [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liabilities 209 125
Duke Energy Ohio [Member] | Other Current Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, net amounts included on the Consolidated Balance Sheets 5 11
Derivative liability, not subject to master netting arrangement 1 1
Derivative liabilities 6 [5] 12 [5]
Duke Energy Ohio [Member] | Other Noncurrent Liabilities [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 98 55
Derivative liability, fair value, gross asset 90 51
Derivative liability, not subject to master netting arrangement 6 7
Duke Energy Ohio [Member] | Other Noncurrent Liabilities [Member] | Gross Amounts Recognized [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liabilities 104 62
Duke Energy Ohio [Member] | Other Noncurrent Liabilities [Member] | Gross Amounts Offset [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liabilities 90 51
Duke Energy Ohio [Member] | Other Noncurrent Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, net amounts included on the Consolidated Balance Sheets 8 4
Derivative liability, not subject to master netting arrangement 6 7
Derivative liabilities 14 [6] 11 [6]
Duke Energy Indiana [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 5 10
Derivative assets 5 [18] 10 [18]
Derivative Liabilities Subject to Master Netting    
Derivative liability, fair value, gross liability 55 63
Derivative liabilities 55 [2] 63 [2]
Duke Energy Indiana [Member] | Other Current Assets [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, gross asset 5 10
Duke Energy Indiana [Member] | Other Current Assets [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Assets Subject to Master Netting    
Derivative asset, fair value, net amounts included on the Condensed Balance Sheet 5 [3] 10 [3]
Duke Energy Indiana [Member] | Other Current Liabilities [Member] | Gross Amounts Recognized [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, not subject to master netting arrangement 55 63
Duke Energy Indiana [Member] | Other Current Liabilities [Member] | Net Amounts On Balance Sheet [Member]
    
Derivative Liabilities Subject to Master Netting    
Derivative liability, not subject to master netting arrangement $ 55 [5] $ 63 [5]
[1] Included in Other within Current Assets and Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
[2] Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheets.
[3] Included in Other within Current Assets on the Condensed Consolidated Balance Sheet.
[4] Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
[5] Included in Other within Current Liabilities on the Condensed Consolidated Balance Sheet.
[6] Included in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
[7] Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
[8] Included in Other Current Assets within Current Assets and Other within Investments and Other Assets in the Condensed Consolidated Balance Sheets.
[9] Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Condensed Consolidated Balance Sheets.
[10] Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Condensed Consolidated Balance Sheets
[11] Included in Other Current Assets within Current Assets and Other within Investments and Other Assets in the Condensed Balance Sheets.
[12] Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Condensed Balance Sheets
[13] Included in Other within Current Assets on the Condensed Balance Sheet.
[14] Included in Other within Investments and Other Assets on the Condensed Balance Sheet.
[15] Included in Other within Current Liabilities on the Condensed Balance Sheet.
[16] Included in Other within Deferred Credits and Other Liabilities on the Condensed Balance Sheet.
[17] Included in Other within Current Assets and Other within Investments and Other Assets in the Condensed Consolidated Balance Sheets.
[18] Included in Other within Current Assets on the Condensed Consolidated Balance Sheets.