Condensed Consolidated Statements of Operations and Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Operating Revenues
Regulated electric	$ 5,167	$ 4,834		$ 10,745	$ 9,723
Nonregulated electric, natural gas and other	675	951		1,499	1,775
Regulated natural gas	107	94		329	279
Total operating revenues	5,949	5,879		12,573	11,777
Operating Expenses
Fuel used in electric generation and purchased power - regulated	1,808	1,678		3,808	3,381
Fuel used in electric generation and purchased power - nonregulated	436	447		845	901
Cost of natural gas and other	43	43		165	147
Operation, maintenance and other	1,467	1,504		2,973	2,925
Depreciation and amortization	761	678		1,551	1,338
Property and other taxes	318	323		676	666
Impairment charges	6	386		1,388	386
Total operating expenses	4,839	5,059		11,406	9,744
Gains on Sales of Other Assets and Other, net	6	1		7	3
Operating Income (Loss)	1,116	821		1,174	2,036
Other Income and Expenses
Equity in earnings of unconsolidated affiliates	33	22		69	58
Other income and expenses, net	89	48		184	128
Total other income and expenses	122	70		253	186
Interest Expense	413	381		819	748
Income (Loss) From Continuing Operations Before Income Taxes	825	510		608	1,474
Income Tax Expense (Benefit) from Continuing Operations	209	165		82	495
Income (Loss) From Continuing Operations	616	345		526	979
Loss From Discontinued Operations, net of tax	(3)	(3)		(6)	(3)
Net Income (Loss)	613	342		520	976
Less: Net Income Attributable to Noncontrolling Interests	4	3		8	3
Net Income (Loss) Attributable to Parent	609	339		512	973
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	1	2			5
Net unrealized gain (loss) on cash flow hedges		44	[1]		54	[1]
Reclassification into earnings from cash flow hedges	(9)			(9)
Other Comprehensive Income (Loss), net of tax	22	(91)		45	(74)
Comprehensive Income (Loss)	635	251		565	902
Comprehensive Income Attributable to Parent	631	252		556	903
Income from continuing operations attributable to Duke Energy Corporation common shareholders
Basic (usd per share)	$ 0.86	$ 0.48		$ 0.73	$ 1.37
Diluted (usd per share)	$ 0.86	$ 0.48		$ 0.73	$ 1.37
Income from discontinued operations attributable to Duke Energy Corporation common shareholders
Basic (usd per share)				$ (0.01)
Diluted (usd per share)				$ (0.01)
Net Income attributable to Duke Energy Corporation common shareholders
Basic (usd per share)	$ 0.86	$ 0.48		$ 0.72	$ 1.37
Diluted (usd per share)	$ 0.86	$ 0.48		$ 0.72	$ 1.37
Weighted-average shares outstanding
Basic (shares)	707	706		707	705
Diluted (shares)	707	706		707	706
Duke Energy Carolinas [Member]
Operating Revenues
Total operating revenues	1,755	1,591		3,755	3,320
Operating Expenses
Fuel used in electric generation and purchased power - regulated	503	443		1,161	961
Operation, maintenance and other	463	479		950	936
Depreciation and amortization	248	226		490	448
Property and other taxes	100	92		204	192
Impairment charges	3			3
Total operating expenses	1,317	1,240		2,808	2,537
Gains on Sales of Other Assets and Other, net					2
Operating Income (Loss)	438	351		947	785
Other Income and Expenses
Other income and expenses, net	44	29		93	65
Interest Expense	102	91		203	173
Income (Loss) From Continuing Operations Before Income Taxes	380	289		837	677
Income Tax Expense (Benefit) from Continuing Operations	110	108		281	252
Net Income (Loss) Attributable to Parent	270	181		556	425
Other Comprehensive Income (Loss), net of tax
Reclassification into earnings from cash flow hedges	1			2
Other Comprehensive Income (Loss), net of tax				2
Comprehensive Income Attributable to Parent	271	181		558	425
Progress Energy [Member]
Operating Revenues
Total operating revenues	2,421	2,281		4,962	4,467
Operating Expenses
Fuel used in electric generation and purchased power - regulated	977	918		2,020	1,778
Operation, maintenance and other	555	533		1,150	1,094
Depreciation and amortization	281	210		557	404
Property and other taxes	137	141		288	282
Impairment charges	(17)	366		(17)	366
Total operating expenses	1,933	2,168		3,998	3,924
Gains on Sales of Other Assets and Other, net	0	1		1	1
Operating Income (Loss)	488	114		965	544
Other Income and Expenses
Other income and expenses, net	13	14		28	37
Interest Expense	167	160		336	358
Income (Loss) From Continuing Operations Before Income Taxes	334	(32)		657	223
Income Tax Expense (Benefit) from Continuing Operations	127	(19)		246	82
Income (Loss) From Continuing Operations	207	(13)		411	141
Loss From Discontinued Operations, net of tax	(5)	(4)		(6)	(4)
Net Income (Loss)	202	(17)		405	137
Less: Net Income Attributable to Noncontrolling Interests	0	0		1	1
Net Income (Loss) Attributable to Parent	202	(17)		404	136
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	0	0		1	1
Net unrealized gain (loss) on cash flow hedges	0	2		0	3
Reclassification into earnings from cash flow hedges	4	0		4	0
Other Comprehensive Income (Loss), net of tax	4	2		5	4
Comprehensive Income (Loss)	206	(15)		410	141
Duke Energy Progress [Member]
Operating Revenues
Total operating revenues	1,191	1,135		2,613	2,351
Operating Expenses
Fuel used in electric generation and purchased power - regulated	454	441		1,027	896
Operation, maintenance and other	347	340		728	692
Depreciation and amortization	142	113		286	250
Property and other taxes	54	53		121	113
Impairment charges	(18)	22		(18)	22
Total operating expenses	979	969		2,144	1,973
Gains on Sales of Other Assets and Other, net				1
Operating Income (Loss)	212	166		470	378
Other Income and Expenses
Other income and expenses, net	7	8		16	22
Interest Expense	58	47		115	95
Income (Loss) From Continuing Operations Before Income Taxes	161	127		371	305
Income Tax Expense (Benefit) from Continuing Operations	60	50		137	118
Net Income (Loss) Attributable to Parent	101	77		234	187
Duke Energy Florida [Member]
Operating Revenues
Total operating revenues	1,225	1,142		2,341	2,110
Operating Expenses
Fuel used in electric generation and purchased power - regulated	523	478		993	883
Operation, maintenance and other	204	198		414	409
Depreciation and amortization	139	90		271	142
Property and other taxes	83	85		167	164
Impairment charges		345		1	345
Total operating expenses	949	1,196		1,846	1,943
Gains on Sales of Other Assets and Other, net		1			1
Operating Income (Loss)	276	(53)		495	168
Other Income and Expenses
Other income and expenses, net	6	5		11	13
Interest Expense	50	43		99	92
Income (Loss) From Continuing Operations Before Income Taxes	232	(91)		407	89
Income Tax Expense (Benefit) from Continuing Operations	90	(34)		157	36
Net Income (Loss) Attributable to Parent	142	(57)		250	53
Other Comprehensive Income (Loss), net of tax
Reclassification into earnings from cash flow hedges				1
Other Comprehensive Income (Loss), net of tax				1
Comprehensive Income Attributable to Parent	142	(57)		251	53
Duke Energy Ohio [Member]
Operating Revenues
Regulated electric	336	339		703	672
Nonregulated electric, natural gas and other	88	378		261	606
Regulated natural gas	107	94		330	280
Total operating revenues	531	811		1,294	1,558
Operating Expenses
Fuel used in electric generation and purchased power - regulated	107	103		231	206
Fuel used in electric generation and purchased power - nonregulated	226	222		357	462
Cost of natural gas and other	25	17		127	93
Operation, maintenance and other	186	212		367	397
Depreciation and amortization	56	89		147	177
Property and other taxes	52	64		127	136
Impairment charges	21			1,438
Total operating expenses	673	707		2,794	1,471
Gains on Sales of Other Assets and Other, net		4			4
Operating Income (Loss)	(142)	108		(1,500)	91
Other Income and Expenses
Other income and expenses, net	2	1		5	3
Interest Expense	29	18		51	36
Income (Loss) From Continuing Operations Before Income Taxes	(169)	91		(1,546)	58
Income Tax Expense (Benefit) from Continuing Operations	(62)	33		(549)	21
Net Income (Loss) Attributable to Parent	(107)	58		(997)	37
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments					1
Other Comprehensive Income (Loss), net of tax					1
Comprehensive Income Attributable to Parent	(107)	58		(997)	38
Duke Energy Indiana [Member]
Operating Revenues
Total operating revenues	748	700		1,593	1,424
Operating Expenses
Fuel used in electric generation and purchased power - regulated	287	276		626	569
Operation, maintenance and other	159	163		325	313
Depreciation and amortization	103	77		205	155
Property and other taxes	21	16		44	38
Total operating expenses	570	532		1,200	1,075
Operating Income (Loss)	178	168		393	349
Other Income and Expenses
Other income and expenses, net	4	6		11	10
Interest Expense	44	43		87	84
Income (Loss) From Continuing Operations Before Income Taxes	138	131		317	275
Income Tax Expense (Benefit) from Continuing Operations	51	49		117	103
Net Income (Loss) Attributable to Parent	87	82		200	172
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments		(1)			(1)
Other Comprehensive Income (Loss), net of tax					(1)
Comprehensive Income Attributable to Parent	$ 87	$ 81		$ 200	$ 171

[1] Net of $14 million tax expense and $18 million tax expense for the three months and six months ended June 30, 2013.