v2.4.0.6
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.