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
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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.

X
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