v2.4.0.6

Organization And Basis Of Presentation (Schedule Of Unbilled Revenues With Restricted Receivables) (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jul. 02, 2012 | Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Stockholders' Equity Note [Abstract] |  |  |  |
Stockholders' equity note, stock split, conversion ratio | 0.333 |  |  |
Unbilled Receivables [Abstract] |  |  |  |
Unbilled receivables, current |  | $ 899 |  | $ 920
Income Amounts Attributable to Parent, Disclosures [Abstract] |  |  |  |
Income (loss) from continuing operations attributable to parent |  | 634 | 293 |
Income (loss) from discontinued operations, net of tax, attributable to parent |  |  | 2 |
Net income (loss) attributable to Duke Energy Corporation |  | 634 | 295 |
Duke Energy Carolinas [Member] |  |  |  |
Unbilled Receivables [Abstract] |  |  |  |
Unbilled receivables, current |  | 314 |  | 315
Progress Energy [Member] |  |  |  |
Unbilled Receivables [Abstract] |  |  |  |
Unbilled receivables, current |  | 193 |  | 187
Income Amounts Attributable to Parent, Disclosures [Abstract] |  |  |  |
Income (loss) from continuing operations attributable to parent |  | 153 | 139 |
Income (loss) from discontinued operations, net of tax, attributable to parent |  |  | 11 |
Net income (loss) attributable to Duke Energy Corporation |  | 153 | 150 |
Duke Energy Progress [Member] |  |  |  |
Unbilled Receivables [Abstract] |  |  |  |
Unbilled receivables, current |  | 115 |  | 112
Duke Energy Florida [Member] |  |  |  |
Unbilled Receivables [Abstract] |  |  |  |
Unbilled receivables, current |  | 78 |  | 74
Duke Energy Ohio [Member] |  |  |  |
Unbilled Receivables [Abstract] |  |  |  |
Unbilled receivables, current |  | 49 |  | 47
Unbilled revenues sold to CRC |  | 74 |  | 90
Duke Energy Indiana [Member] |  |  |  |
Unbilled Receivables [Abstract] |  |  |  |
Unbilled receivables, current |  | 3 |  | 3
Unbilled revenues sold to CRC |  | $ 122 |  | $ 132

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