Regulatory Matters (Narrative) (Details) (USD $)	12 Months Ended						12 Months Ended			12 Months Ended		12 Months Ended					12 Months Ended					12 Months Ended																		12 Months Ended			12 Months Ended		12 Months Ended												12 Months Ended	24 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Duke Energy Carolinas [Member]	Dec. 31, 2011 Duke Energy Carolinas [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] Rate Case [Member] NCUC [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] Rate Case [Member] NCUC [Member] Removal Costs Reduction Year One [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] Rate Case [Member] NCUC [Member] Removal Costs Reduction Year Two [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] Rate Case [Member] PSCSC [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] Rate Case [Member] PSCSC [Member] Removal Costs Reduction [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] Rate Case Step One [Member] NCUC [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] Rate Case Step One [Member] PSCSC [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] Rate Case Step Two [Member] NCUC [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] Rate Case Step Two [Member] PSCSC [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member] William State Lee III Nuclear Station [Member]	Dec. 31, 2013 Duke Energy Progress [Member]	Dec. 31, 2012 Duke Energy Progress [Member]	Dec. 31, 2011 Duke Energy Progress [Member]	Dec. 31, 2013 Duke Energy Progress [Member] Rate Case [Member] NCUC [Member]	Dec. 31, 2013 Duke Energy Progress [Member] Rate Case [Member] NCUC [Member] Removal Costs Reduction [Member]	Dec. 31, 2013 Duke Energy Progress [Member] Rate Case Step One [Member] NCUC [Member]	Dec. 31, 2013 Duke Energy Progress [Member] Rate Case Step Two [Member] NCUC [Member]	Dec. 31, 2013 Duke Energy Progress [Member] Shearon Harris Nuclear Station [Member]	Dec. 31, 2013 Duke Energy Florida [Member]	Dec. 31, 2012 Duke Energy Florida [Member]	Dec. 31, 2011 Duke Energy Florida [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Removal Costs [Member]	Dec. 31, 2012 Duke Energy Florida [Member] Removal Costs [Member]	Dec. 31, 2011 Duke Energy Florida [Member] Removal Costs [Member]	Dec. 31, 2013 Duke Energy Florida [Member] 2012 FPSC Settlement Agreement [Member]	Dec. 31, 2013 Duke Energy Florida [Member] 2013 FPSC Settlement Agreement [Member] New Generation Needs [Member] MW	Dec. 31, 2013 Duke Energy Florida [Member] 2013 FPSC Settlement Agreement [Member] Minimum [Member]	Dec. 31, 2013 Duke Energy Florida [Member] 2013 FPSC Settlement Agreement [Member] Maximum [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Crystal River Unit 3 [Member]	Dec. 31, 2012 Duke Energy Florida [Member] Crystal River Unit 3 [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Crystal River Unit 3 [Member] Retail Portion [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Crystal River Unit 3 [Member] Minimum [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Crystal River Unit 3 [Member] Maximum [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Crystal River Unit 3 [Member] 2013 FPSC Settlement Agreement [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Crystal River Unit 3 [Member] 2013 FPSC Settlement Agreement [Member] Amount Subject To Cost Cap [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Crystal River Unit 3 [Member] 2013 FPSC Settlement Agreement [Member] Uprate And Dry Cask Storage Projects [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Crystal River Unit 3 [Member] NEIL Settlement [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Levy Nuclear Station [Member]	Dec. 31, 2013 Duke Energy Florida [Member] Levy Nuclear Station [Member] 2013 FPSC Settlement Agreement [Member]	Dec. 31, 2013 Duke Energy Ohio [Member]	Dec. 31, 2012 Duke Energy Ohio [Member]	Dec. 31, 2011 Duke Energy Ohio [Member]	Dec. 31, 2013 Duke Energy Ohio [Member] Electric Rate Case [Member] PUCO [Member]	Dec. 31, 2013 Duke Energy Ohio [Member] Natural Gas Rate Case [Member] PUCO [Member]	Dec. 31, 2013 Duke Energy Ohio [Member] MGP Remidiation [Member] PUCO [Member]	Dec. 31, 2013 Duke Energy Ohio [Member] Capacity Rider Filing [Member]	Dec. 31, 2013 Duke Energy Ohio [Member] RTO Realignment [Member]	Dec. 31, 2012 Duke Energy Indiana [Member]	Dec. 31, 2011 Duke Energy Indiana [Member]	Dec. 31, 2013 Duke Energy Indiana [Member]	Dec. 31, 2012 Duke Energy Indiana [Member] Edwardsport IGCC Plant [Member]	Dec. 31, 2012 Duke Energy Indiana [Member] Edwardsport IGCC Plant [Member]	Dec. 31, 2013 Duke Energy Indiana [Member] Edwardsport IGCC Plant [Member] Edwardsport Event October 30, 2012 [Member]	Dec. 31, 2013 Duke Energy Indiana [Member] Edwardsport IGCC Plant [Member] Edwardsport Event November 20, 2007 [Member]	Dec. 31, 2013 Duke Energy Indiana [Member] Edwardsport IGCC Plant [Member] Edwardsport Event December 27, 2012 [Member]
Public Utilities, General Disclosures [Line Items]
Combined cycle capacity, MW																																1,150
Additional generation capacity, MW																																1,800
Estimated capital cost of new utility plant excluding AFUDC.																																																											$ 3,150,000,000
Estimated capital cost of new utility plant, including AFUDC																																																												1,985,000,000	2,595,000,000
Net property, plant and equipment	69,490,000,000	68,558,000,000		22,826,000,000		23,012,000,000										382,000,000	13,650,000,000	13,062,000,000							9,611,000,000	9,360,000,000																		117,000,000		8,235,000,000	8,126,000,000							8,320,000,000		8,576,000,000
Approved rate increase amount by state commission												204,000,000	80,000,000	30,000,000	38,000,000							147,000,000	31,000,000								150,000,000																		49,000,000		56,000,000
Requested rate increase amount to state commission																																																				729,000,000
Rate increase begin date							9/25/2013			9/18/2013										6/1/2013																													5/1/2013
Approved percentage rate increase by state commission												4.50%	5.50%	0.60%	2.60%							4.50%	1.00%																										2.90%
Approved return on equity percentage amount by state commission							10.20%			10.20%										10.20%												10.50%	9.50%	11.50%						7.35%									9.84%	9.84%
Approved equity capital structure, percentage							53.00%			53.00%										53.00%
Required shareholder contribution to low income customers or agencies.							10,000,000			4,000,000										20,000,000
Impairment charges	399,000,000	666,000,000	335,000,000	31,000,000	12,000,000												22,000,000	54,000,000	3,000,000					22,000,000	358,000,000	146,000,000	0													295,000,000					65,000,000	5,000,000	2,000,000	89,000,000						579,000,000	234,000,000		631,000,000	897,000,000
Cost Cap for customers																																								1,466,000,000
MISO estimate of Duke Energy Ohio's MVP obligation																																														2,700,000,000
Recovery costs not sought																																																					121,000,000
Repair costs, range of possible costs																																						900,000,000	1,300,000,000
Joint owner settlement amount																																			57,000,000	45,000,000
Net unrecovered investment																																												264,000,000
Amount of reduction to carrying amount of regulatory liabilities																												114,000,000	178,000,000	250,000,000
Independent review repair costs																																						1,490,000,000	3,430,000,000
Decommissioning cost study estimate																																			1,180,000,000
Total insurance proceeds received to date																																											835,000,000
Current year insurance proceeds received to date																																											530,000,000
Future customer credit																																													10,000,000
Acceleration of cash recovery through fuel clause																																								130,000,000
Regulatory assets, current	895,000,000	737,000,000		221,000,000		295,000,000											127,000,000	77,000,000							221,000,000	179,000,000																		97,000,000		57,000,000	46,000,000							126,000,000		118,000,000
Regulatory assets, noncurrent	9,191,000,000	11,004,000,000		1,727,000,000		1,527,000,000											1,384,000,000	1,845,000,000						47,000,000	2,729,000,000	3,321,000,000											134,000,000				1,310,000,000,000	323,000,000		50,000,000		471,000,000	579,000,000						74,000,000	810,000,000		717,000,000
Regulatory liability, noncurrent	$ 5,949,000,000	$ 5,584,000,000		$ 2,102,000,000		$ 2,576,000,000		$ 30,000,000	$ 30,000,000		$ 45,000,000						$ 1,673,000,000	$ 1,538,000,000			$ 20,000,000				$ 618,000,000	$ 787,000,000																	$ 490,000,000			$ 262,000,000	$ 254,000,000							$ 741,000,000		$ 782,000,000