|
Commitments and Contingencies (Narrative) (Details) (USD $)
|
9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Sep. 30, 2014
Brazil Expansion Lawsuit [Member]
|
Sep. 30, 2014
Duke Energy Carolinas [Member]
North Carolina Ash Basins [Member]
Dan River [Member]
|
Feb. 21, 2014
Duke Energy Carolinas [Member]
North Carolina Ash Basins [Member]
Minimum [Member]
Dan River [Member]
gal
T
|
Feb. 21, 2014
Duke Energy Carolinas [Member]
North Carolina Ash Basins [Member]
Maximum [Member]
Dan River [Member]
T
gal
|
Sep. 30, 2014
Duke Energy Carolinas [Member]
New Source Review Provisions Of Clean Air Act [Member]
Claims
plant
project
|
Sep. 30, 2014
Duke Energy Carolinas [Member]
Asbestos Issue [Member]
|
Dec. 31, 2013
Duke Energy Carolinas [Member]
Asbestos Issue [Member]
|
Sep. 30, 2014
Duke Energy Carolinas [Member]
Asbestos Issue [Member]
Malignant Asbestos Claim [Member]
Claims
|
Sep. 30, 2014
Duke Energy Carolinas [Member]
Asbestos Issue [Member]
Non Malignant Asbestos Claim [Member]
Claims
|
Oct. 03, 2012
Progress Energy [Member]
Synthetic Fuels [Member]
|
Dec. 31, 2009
Progress Energy [Member]
Synthetic Fuels [Member]
|
Dec. 31, 2012
Progress Energy [Member]
Synthetic Fuels [Member]
|
Sep. 30, 2014
Duke Energy Progress [Member]
Spent Nuclear Fuels [Member]
|
Sep. 30, 2014
Duke Energy Florida [Member]
Spent Nuclear Fuels [Member]
|
Mar. 31, 2014
Duke Energy Florida [Member]
Westinghouse Electric Company Litigation [Member]
|
Mar. 28, 2014
Duke Energy Florida [Member]
Westinghouse Electric Company Litigation [Member]
|
Dec. 11, 2012
Duke Energy Indiana [Member]
Edwardsport IGCC Plant [Member]
|
|
| Valuation and Qualifying Accounts [Abstract] | |||||||||||||||||
| Coal ash released, in tons | 30,000 | 39,000 | |||||||||||||||
| Basin water released, in gallons | 24,000,000 | 27,000,000 | |||||||||||||||
| Environmental remediation expense | $ 20,000,000 | ||||||||||||||||
| Obligation to expand installed generation capacity, percent | 15.00% | ||||||||||||||||
| Maximum civil penalties per day for each violation | 37,500 | ||||||||||||||||
| Projects with Alleged NSR Violations | 29 | ||||||||||||||||
| Number of Coal Plants with Alleged NSR Violations | 25 | ||||||||||||||||
| Number of Retired Plants | 11 | ||||||||||||||||
| Loss contingency, pending claims, number | 13 | 23 | 61 | ||||||||||||||
| Remaining Number of Coal Plants with Alleged NSR Violations | 13 | ||||||||||||||||
| Asbestos-related injuries and damages reserves | 591,000,000 | 616,000,000 | 7,000,000 | 13,000,000 | |||||||||||||
| Reinsurance retention policy, amount retained | 476,000,000 | ||||||||||||||||
| Reinsurance retention policy, excess retention, amount reinsured | 864,000,000 | ||||||||||||||||
| Probable insurance recoveries | 616,000,000 | 649,000,000 | |||||||||||||||
| Loss contingency, damages paid, value | 154,000,000 | ||||||||||||||||
| Damages awarded to plaintiff | 90,000,000 | ||||||||||||||||
| Gain recognized in period | 63,000,000 | ||||||||||||||||
| Gain (Loss) Related to Litigation Settlement | 83,000,000 | 21,000,000 | |||||||||||||||
| Loss contingency, damages sought, value | 510,000,000 | ||||||||||||||||
| Gain contingency, unrecorded amount | $ 54,000,000 | $ 560,000,000 | |||||||||||||||