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, 2014 MW		Dec. 31, 2013
Public Utilities, General Disclosures [Line Items]
Megawatt of potential plants to be retired	2,297
Net property, plant and equipment	$ 66,355		$ 69,490
Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Net property, plant and equipment	255	[1]
Duke Energy Carolinas [Member]
Public Utilities, General Disclosures [Line Items]
Megawatt of potential plants to be retired	200	[2]
Net property, plant and equipment	23,171		23,012
Duke Energy Carolinas [Member] | Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Net property, plant and equipment	13	[1],[2]
Progress Energy [Member]
Public Utilities, General Disclosures [Line Items]
Megawatt of potential plants to be retired	873
Net property, plant and equipment	23,367		23,382
Progress Energy [Member] | Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Net property, plant and equipment	112	[1]
Duke Energy Progress [Member]
Public Utilities, General Disclosures [Line Items]
Net property, plant and equipment	13,728		13,650
Duke Energy Florida [Member]
Public Utilities, General Disclosures [Line Items]
Megawatt of potential plants to be retired	873	[3]
Net property, plant and equipment	9,636		9,611
Duke Energy Florida [Member] | Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Net property, plant and equipment	112	[1],[3]
Duke Energy Ohio [Member]
Public Utilities, General Disclosures [Line Items]
Megawatt of potential plants to be retired	556	[4]
Net property, plant and equipment	4,833		8,235
Duke Energy Ohio [Member] | Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Net property, plant and equipment	9	[1],[4]
Duke Energy Indiana [Member]
Public Utilities, General Disclosures [Line Items]
Megawatt of potential plants to be retired	668	[5]
Net property, plant and equipment	8,584		8,576
Duke Energy Indiana [Member] | Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Net property, plant and equipment	$ 121	[1],[5]

[1] Included in Property, plant and equipment, net as of March 31, 2014, on the Condensed Consolidated Balance Sheets.

[2] Includes Lee Units 1 and 2. Excludes 170 MW Lee Unit 3 that is expected to be converted to gas in 2014. Duke Energy Carolinas expects to retire or convert these units by December 2020 in conjunction with a settlement agreement associated with the Cliffside Unit 6 air permit.

[3] Includes Crystal River Units 1 and 2.

[4] Includes Beckjord Units 5 and 6 and Miami Fort Unit 6. Beckjord units have no remaining book value.

[5] Includes Wabash River Units 2 through 6. Wabash River Unit 6 is being evaluated for potential conversion to gas. Duke Energy Indiana committed to retire or convert these units by June 2018 in conjunction with a settlement agreement associated with the Edwardsport air permit.