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			12 Months Ended				12 Months Ended				12 Months Ended						12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Generation Facilities To Be Retired [Member] MW		Dec. 31, 2013 Duke Energy Carolinas [Member]	Dec. 31, 2012 Duke Energy Carolinas [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] Generation Facilities To Be Retired [Member] MW		Dec. 31, 2013 Progress Energy [Member]	Dec. 31, 2012 Progress Energy [Member]	Dec. 31, 2013 Progress Energy [Member] Generation Facilities To Be Retired [Member] MW		Dec. 31, 2013 Duke Energy Progress [Member]	Dec. 31, 2012 Duke Energy Progress [Member]	Dec. 31, 2013 Duke Energy Florida [Member]	Dec. 31, 2012 Duke Energy Florida [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Generation Facilities To Be Retired [Member] MW		Dec. 31, 2013 Duke Energy Ohio [Member]	Dec. 31, 2012 Duke Energy Ohio [Member]	Dec. 31, 2013 Duke Energy Ohio [Member] Generation Facilities To Be Retired [Member] MW		Dec. 31, 2013 Duke Energy Indiana [Member]	Dec. 31, 2012 Duke Energy Indiana [Member]	Dec. 31, 2013 Duke Energy Indiana [Member] Generation Facilities To Be Retired [Member] MW
Public Utilities, General Disclosures [Line Items]
Megawatt of potential plants to be retired			2,447				200	[1]			873	[2]					873	[2]			706	[3]			668	[4]
Net property, plant and equipment	$ 69,490	$ 68,558	$ 260	[5]	$ 23,012	$ 22,826	$ 14	[1],[5]	$ 23,382	$ 22,697	$ 113	[2],[5]	$ 13,650	$ 13,062	$ 9,611	$ 9,360	$ 113	[2],[5]	$ 8,235	$ 8,126	$ 10	[3],[5]	$ 8,576	$ 8,320	$ 123	[4],[5]

[1] 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.

[2] Includes Crystal River Units 1 and 2.

[3] Includes Beckjord Units 4 through 6 and Miami Fort Unit 6. 150 MW Beckjord Station Unit 4 was retired on February 17, 2014. Beckjord units have no remaining book value.

[4] 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.

[5] Included in Property, plant and equipment, net as of December 31, 2013, on the Consolidated Balance Sheets.