Quarterly Financial Data (Unaudited) (Schedule of Quarterly Financial Information) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	$ 5,559us-gaap_SalesRevenueNet	$ 6,395us-gaap_SalesRevenueNet	$ 5,708us-gaap_SalesRevenueNet	$ 6,263us-gaap_SalesRevenueNet	$ 5,610us-gaap_SalesRevenueNet	$ 6,217us-gaap_SalesRevenueNet	$ 5,393us-gaap_SalesRevenueNet	$ 5,536us-gaap_SalesRevenueNet	$ 23,925us-gaap_SalesRevenueNet	$ 22,756us-gaap_SalesRevenueNet	$ 17,912us-gaap_SalesRevenueNet
Operating income (loss)	988us-gaap_OperatingIncomeLoss	1,619us-gaap_OperatingIncomeLoss	1,289us-gaap_OperatingIncomeLoss	1,362us-gaap_OperatingIncomeLoss	1,193us-gaap_OperatingIncomeLoss	1,660us-gaap_OperatingIncomeLoss	742us-gaap_OperatingIncomeLoss	1,259us-gaap_OperatingIncomeLoss	5,258us-gaap_OperatingIncomeLoss	4,854us-gaap_OperatingIncomeLoss	2,911us-gaap_OperatingIncomeLoss
Income (loss) from continuing operations	99	891	725	750	689	946	292	663	2,465	2,590	1,611
Income (Loss) From Discontinued Operations, net of tax	1	378	(112)	(843)	3	62	50	(29)	(576)	86	171
Net income (loss)	100us-gaap_ProfitLoss	1,269us-gaap_ProfitLoss	613us-gaap_ProfitLoss	(93)us-gaap_ProfitLoss	692us-gaap_ProfitLoss	1,008us-gaap_ProfitLoss	342us-gaap_ProfitLoss	634us-gaap_ProfitLoss	1,889us-gaap_ProfitLoss	2,676us-gaap_ProfitLoss	1,782us-gaap_ProfitLoss
Net income (loss) attributable to Parent	97us-gaap_NetIncomeLoss	1,274us-gaap_NetIncomeLoss	609us-gaap_NetIncomeLoss	(97)us-gaap_NetIncomeLoss	688us-gaap_NetIncomeLoss	1,004us-gaap_NetIncomeLoss	339us-gaap_NetIncomeLoss	634us-gaap_NetIncomeLoss	1,883us-gaap_NetIncomeLoss	2,665us-gaap_NetIncomeLoss	1,768us-gaap_NetIncomeLoss
Income (loss) from continuing operations attributable to Duke Energy Corporation common shareholders [Abstract]
Basic	$ 0.14	$ 1.25	$ 1.02	$ 1.05	$ 0.96	$ 1.33	$ 0.40	$ 0.93	$ 3.46	$ 3.64	$ 2.77
Diluted	$ 0.14	$ 1.25	$ 1.02	$ 1.05	$ 0.96	$ 1.33	$ 0.40	$ 0.93	$ 3.46	$ 3.63	$ 2.77
Income (loss) from discontinued operations attributable To Duke Energy Corporation common shareholders [Abstract]
Basic		$ 0.55	$ (0.16)	$ (1.19)	$ 0.01	$ 0.09	$ 0.08	$ (0.04)	$ (0.80)	$ 0.13	$ 0.30
Diluted		$ 0.55	$ (0.16)	$ (1.19)	$ 0.01	$ 0.09	$ 0.08	$ (0.04)	$ (0.80)	$ 0.13	$ 0.30
Net income attributable to Duke Energy Corporation common shareholders [Abstract]
Basic	$ 0.14us-gaap_EarningsPerShareBasic	$ 1.80us-gaap_EarningsPerShareBasic	$ 0.86us-gaap_EarningsPerShareBasic	$ (0.14)us-gaap_EarningsPerShareBasic	$ 0.97us-gaap_EarningsPerShareBasic	$ 1.42us-gaap_EarningsPerShareBasic	$ 0.48us-gaap_EarningsPerShareBasic	$ 0.89us-gaap_EarningsPerShareBasic	$ 2.66us-gaap_EarningsPerShareBasic	$ 3.77us-gaap_EarningsPerShareBasic	$ 3.07us-gaap_EarningsPerShareBasic
Diluted	$ 0.14us-gaap_EarningsPerShareDiluted	$ 1.80us-gaap_EarningsPerShareDiluted	$ 0.86us-gaap_EarningsPerShareDiluted	$ (0.14)us-gaap_EarningsPerShareDiluted	$ 0.97us-gaap_EarningsPerShareDiluted	$ 1.42us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 0.89us-gaap_EarningsPerShareDiluted	$ 2.66us-gaap_EarningsPerShareDiluted	$ 3.76us-gaap_EarningsPerShareDiluted	$ 3.07us-gaap_EarningsPerShareDiluted
Duke Energy Carolinas [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	1,658	1,938	1,755	2,000	1,715	1,919	1,591	1,729	7,351	6,954	6,665
Operating income (loss)	318	630	438	509	420	604	351	434	1,895	1,809	1,517
Net income (loss)	139	377	270	286	209	342	181	244	1,072	976
Net income (loss) attributable to Parent									1,072	976	865
Progress Energy [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	2,341	2,863	2,421	2,541	2,300	2,766	2,281	2,186	10,166	9,533	9,405
Operating income (loss)	388	665	488	477	403	671	114	430	2,018	1,618	1,137
Income (loss) from continuing operations	139	330	207	204	190	328	(13)	154	880	659	355
Income (Loss) From Discontinued Operations, net of tax									(6)	16	52
Net income (loss)	139	330	202	203	196	342	(17)	154	874	675	407
Net income (loss) attributable to Parent	136	329	202	202	195	341	(17)	153	869	672	400
Duke Energy Progress [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	1,196	1,367	1,191	1,422	1,211	1,430	1,135	1,216	5,176	4,992	4,706
Operating income (loss)	180	285	212	258	251	303	166	212	935	932	510
Net income (loss)	76	157	101	133	138	175	77	110	467	500	272
Duke Energy Florida [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	1,143	1,491	1,225	1,116	1,085	1,332	1,142	968	4,975	4,527	4,689
Operating income (loss)	205	378	276	219	151	369	(53)	221	1,078	688	629
Net income (loss)	93	205	142	108	75	197	(57)	110	548	325	266
Duke Energy Ohio [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	480	446	412	575	456	438	408	503	1,913	1,805	1,820
Operating income (loss)	74	58	62	(7)	49	50	27	56	187	182	159
Income (loss) from continuing operations									68	67	45
Income (Loss) From Discontinued Operations, net of tax	34	413	(135)	(875)	(4)	35	51	(47)	(563)	35	130
Net income (loss)	64	439	(108)	(890)	6	59	58	(21)	(495)	102	175
Net income (loss) attributable to Parent									(495)	102	175
Duke Energy Indiana [Member]
Quarterly Financial Information Disclosure [Line Items]
Operating revenues	792	790	748	845	747	755	700	724	3,175	2,926	2,717
Operating income (loss)	130	182	178	215	181	203	168	181	705	733	(75)
Net income (loss)	58	101	87	113	82	104	82	90	359	358
Net income (loss) attributable to Parent									$ 359	$ 358	$ (50)

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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