Employee Benefit Plans (Assumptions Used For Pension Benefits Accounting) (Details)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.10%		5.10%		5.00%
Salary increase (graded by age)	4.30%		4.40%		4.10%
Discount rate	4.40%		5.00%		5.50%
Salary increase			4.10%		4.50%
Expected long-term rate of return on plan assets	8.00%		8.25%		8.50%
Qualified Pension Plans [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.10%		4.75%		5.55%
Salary increase (graded by age)	4.00%		4.00%		4.50%
Discount rate			5.55%		6.00%
Salary increase	4.00%		4.50%		4.50%
Expected long-term rate of return on plan assets			8.50%		8.75%
Qualified Pension Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%
Qualified Pension Plans [Member] | Minimum [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%
Expected long-term rate of return on plan assets	8.00%
Qualified Pension Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.10%
Qualified Pension Plans [Member] | Maximum [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.75%
Expected long-term rate of return on plan assets	8.25%
Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.10%		5.10%		5.00%
Salary increase (graded by age)	4.30%		4.40%		4.10%
Discount rate			5.00%		5.50%
Salary increase	4.40%		4.10%		4.50%
Non-Qualified Pension Plans [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.10%		4.80%		5.60%
Salary increase (graded by age)			5.25%		5.25%
Discount rate			5.60%		6.05%
Salary increase			5.25%		5.25%
Non-Qualified Pension Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%
Non-Qualified Pension Plans [Member] | Minimum [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%
Non-Qualified Pension Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.10%
Non-Qualified Pension Plans [Member] | Maximum [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.80%
Other Post-Retirement Benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.10%		5.10%		5.00%
Discount rate			5.00%		5.50%
Assumed tax rate	35.00%	[1],[2]	35.00%	[1],[2]	35.00%	[1],[2]
Other Post-Retirement Benefit plans [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.10%		4.85%		5.75%
Discount rate			5.70%		6.05%
Expected long-term rate of return on plan assets			5.00%	[3]	6.60%	[3]
Other Post-Retirement Benefit plans [Member] | Progress Energy Carolinas [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets					8.75%
Other Post-Retirement Benefit plans [Member] | Progress Energy Florida [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	5.00%		5.00%		5.00%
Other Post-Retirement Benefit plans [Member] | Duke Energy Ohio [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	8.00%		8.25%		8.50%
Other Post-Retirement Benefit plans [Member] | Duke Energy Indiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	8.00%		8.25%		8.50%
Other Post-Retirement Benefit plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%
Expected long-term rate of return on plan assets	5.20%		5.36%		5.53%
Other Post-Retirement Benefit plans [Member] | Minimum [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.60%
Other Post-Retirement Benefit plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.10%
Expected long-term rate of return on plan assets	8.00%	[4]	8.25%	[4]	8.50%	[4]
Other Post-Retirement Benefit plans [Member] | Maximum [Member] | Progress Energy [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.85%
Expected long-term rate of return on plan assets	5.00%	[3]

[1] Applicable to the health care portion of funded post-retirement benefits.

[2] Does not apply to Duke Energy Ohio and Duke Energy Indiana.

[3] The weighted-average actuarial assumptions used by Progress Energy Carolinas and Progress Energy Florida were not materially different from the assumptions above, as applicable, with the exception of the expected long-term rate of return on plan assets which was 5.00% for all years presented for Progress Energy Florida and 8.75% in 2010 for Progress Energy Carolinas. Progress Energy Florida held no other post-retirement benefit plan assets as of December 31, 2012. Progress Energy Carolinas held no other post-retirement plan assets after December 31, 2010.

[4] The expected long-term rate of return on plan assets for Duke Energy Ohio and Duke Energy Indiana was 8.00%, 8.25% and 8.50% as of December 31, 2012, 2011 and 2010, respectively.