Regulatory Matters (Schedule Of Net Carrying Value Of Facilities As Well As The Remaining Non-current Regulatory Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 MW		Dec. 31, 2012
Megawatt of potential plants to be retired	3,954
Remaining net book value of potential plants to be retired	$ 415	[1]
Generation Facilities To Be Retired Net	130		136
Duke Energy Carolinas [Member]
Megawatt of potential plants to be retired	910	[2]
Remaining net book value of potential plants to be retired	98	[1],[2],[3]
Generation Facilities To Be Retired Net	68		73
Retired MW	587
Megawatts committed to be retired	1,667
Progress Energy [Member]
Megawatt of potential plants to be retired	1,448
Remaining net book value of potential plants to be retired	175	[1]
Generation Facilities To Be Retired Net	62		63
Duke Energy Progress [Member]
Megawatt of potential plants to be retired	575	[4]
Remaining net book value of potential plants to be retired	62	[1],[3],[4]
Generation Facilities To Be Retired Net	62		63
Duke Energy Florida [Member]
Megawatt of potential plants to be retired	873	[5]
Remaining net book value of potential plants to be retired	113	[1],[5]
Duke Energy Ohio [Member]
Megawatt of potential plants to be retired	928	[6]
Remaining net book value of potential plants to be retired	12	[1],[6]
Duke Energy Indiana [Member]
Megawatt of potential plants to be retired	668	[7]
Remaining net book value of potential plants to be retired	$ 130	[1],[7]

[1] Included in Property, plant and equipment, net as of March 31, 2013, on the Condensed Consolidated Balance Sheets, unless otherwise noted.

[2] Includes Riverbend Units 4 through 7, Lee Units 1 and 2 and Buck Units 5 and 6. Duke Energy Carolinas has committed to retire 1,667 MW in conjunction with a Cliffside air permit settlement, of which 587 MW have already been retired as of March 31, 2013. Duke Energy Carolinas retired 710 MW for Riverbend Units 4 through 7 and Buck Units 5 and 6 on April 1, 2013. Excludes 170 MW Lee Unit 3 that is expected to be converted to gas in 2014. The Lee Unit 3 conversion will be considered a retirement toward meeting the 1,667 MW retirement commitment.

[3] Net book value of Duke Energy Carolinas' Buck Units 5 and 6 of $68 million, and Duke Energy Progress' Sutton Station of $62 million is included in Generation facilities to be retired, net, on the Condensed Consolidated Balance Sheets at March 31, 2013.

[4] Includes Sutton Station, which is expected to be retired by the end of 2013.

[5] Includes Crystal River Units 1 and 2.

[6] Includes Beckjord Station Units 2 through 6 and Miami Fort Unit 6. Beckjord has no remaining book value. Beckjord Unit 1 was retired May 1, 2012.

[7] Includes Wabash River Units 2 through 6.