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Goodwill	9 Months Ended
Sep. 30, 2012
Goodwill Disclosure [Abstract]
Goodwill	7. GOODWILL In the third quarter of 2012, Progress Energy changed its goodwill impairment testing date for the PEC and PEF reporting units from October 31 to August 31. The change in the goodwill impairment test date is preferable as it better aligns the annual goodwill impairment testing procedures for PEC and PEF with the other reporting units of Duke Energy. This change in accounting principle did not accelerate, delay, avoid, or cause a goodwill impairment charge. Neither the change in the goodwill impairment testing date nor the merger resulted in any changes to the PEC or PEF reporting units. Due to significant judgments and estimates that are utilized in a goodwill impairment analysis, we determined it was impracticable to objectively determine, without the use of hindsight, projected cash flows and related valuation estimates as of each August 31 for periods prior to August 31, 2012. As such, we have prospectively applied the change in the annual goodwill impairment testing date from August 31, 2012. The results of our 2012 annual test of goodwill indicated the carrying amounts of goodwill were not impaired.

Goodwill

9 Months Ended

Sep. 30, 2012

7. GOODWILL

In the third quarter of 2012, Progress Energy changed its goodwill impairment testing date for the PEC and PEF reporting units from October 31 to August 31. The change in the goodwill impairment test date is preferable as it better aligns the annual goodwill impairment testing procedures for PEC and PEF with the other reporting units of Duke Energy. This change in accounting principle did not accelerate, delay, avoid, or cause a goodwill impairment charge. Neither the change in the goodwill impairment testing date nor the merger resulted in any changes to the PEC or PEF reporting units. Due to significant judgments and estimates that are utilized in a goodwill impairment analysis, we determined it was impracticable to objectively determine, without the use of hindsight, projected cash flows and related valuation estimates as of each August 31 for periods prior to August 31, 2012. As such, we have prospectively applied the change in the annual goodwill impairment testing date from August 31, 2012. The results of our 2012 annual test of goodwill indicated the carrying amounts of goodwill were not impaired.