Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating Revenues
Regulated electric	$ 4,965	$ 5,090	$ 10,018	$ 10,547
Nonregulated electric and other	422	403	822	780
Regulated natural gas	97	96	266	327
Total operating revenues	5,484	5,589	11,106	11,654
Operating Expenses
Fuel used in electric generation and purchased power – regulated	1,509	1,721	3,086	3,662
Fuel used in electric generation and purchased power – nonregulated	82	118	140	222
Cost of natural gas	21	26	81	137
Operation, maintenance and other	1,431	1,422	2,920	2,848
Depreciation and amortization	813	790	1,627	1,567
Property and other taxes	293	279	590	543
Impairment charges	195		198
Total operating expenses	4,344	4,356	8,642	8,979
Gains on Sales of Other Assets and Other, net	5	13	14	27
Operating Income	1,145	1,246	2,478	2,702
Other Income and Expenses
Equity in earnings of unconsolidated affiliates	15	23	23	36
Other income and expenses, net	92	72	171	146
Total other income and expenses	107	95	194	182
Interest Expense	500	403	1,011	806
Income From Continuing Operations Before Income Taxes	752	938	1,661	2,078
Income Tax Expense from Continuing Operations	239	334	452	698
Income from Continuing Operations	513	604	1,209	1,380
(Loss) Income From Discontinued Operations, net of tax	(1)	(57)	2	34
Net income	512	547	1,211	1,414
Less: Net Income Attributable to Noncontrolling Interests	3	4	8	7
Net Income (Loss) Attributable to Parent	509	543	1,203	1,407
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	2	7	2	2
Reclassification into earnings from cash flow hedges		1	2	5
Unrealized (losses) gains on available-for-sale securities	3	(3)	7	(3)
Other Comprehensive Income, net of tax	52	23	93	(110)
Comprehensive Income	564	570	1,304	1,304
Less: Comprehensive Income Attributable to Noncontrolling Interests	6	3	12	2
Comprehensive Income Attributable to Parent	$ 558	$ 567	$ 1,292	$ 1,302
Income from continuing operations attributable to Duke Energy Corporation common stockholders
Basic (usd per share)	$ 0.74	$ 0.87	$ 1.74	$ 1.96
Diluted (usd per share)	0.74	0.87	1.74	1.96
(Loss) Income from discontinued operations attributable to Duke Energy Corporation common stockholders
Basic (usd per share)		(0.09)		0.05
Diluted (usd per share)		(0.09)		0.05
Net income attributable to Duke Energy Corporation common stockholders
Basic (usd per share)	0.74	0.78	1.74	2.01
Diluted (usd per share)	$ 0.74	$ 0.78	$ 1.74	$ 2.01
Weighted average shares outstanding
Basic (shares)	689	692	689	700
Diluted (shares)	690	692	689	700
Duke Energy Carolinas [Member]
Operating Revenues
Total operating revenues	$ 1,675	$ 1,707	$ 3,415	$ 3,608
Operating Expenses
Fuel used in electric generation and purchased power – regulated	389	427	810	1,005
Operation, maintenance and other	476	469	988	958
Depreciation and amortization	275	261	534	510
Property and other taxes	71	67	138	137
Total operating expenses	1,211	1,224	2,470	2,610
Operating Income	464	483	945	998
Other Income and Expenses
Other income and expenses, net	45	41	82	83
Interest Expense	107	106	214	208
Income From Continuing Operations Before Income Taxes	402	418	813	873
Income Tax Expense from Continuing Operations	141	153	281	316
Net Income (Loss) Attributable to Parent	261	265	532	557
Other Comprehensive Income (Loss), net of tax
Reclassification into earnings from cash flow hedges			1
Other Comprehensive Income, net of tax			1
Comprehensive Income Attributable to Parent	261	265	533	557
Progress Energy [Member]
Operating Revenues
Total operating revenues	2,348	2,476	4,680	5,012
Operating Expenses
Fuel used in electric generation and purchased power – regulated	852	1,003	1,712	2,035
Operation, maintenance and other	525	568	1,117	1,133
Depreciation and amortization	296	283	586	570
Property and other taxes	120	124	239	235
Impairment charges	1		3
Total operating expenses	1,794	1,978	3,657	3,973
Gains on Sales of Other Assets and Other, net	6	6	12	14
Operating Income	560	504	1,035	1,053
Other Income and Expenses
Other income and expenses, net	28	19	48	46
Interest Expense	160	166	320	334
Income From Continuing Operations Before Income Taxes	428	357	763	765
Income Tax Expense from Continuing Operations	154	140	277	284
Income from Continuing Operations	274	217	486	481
(Loss) Income From Discontinued Operations, net of tax				(1)
Net income	274	217	486	480
Less: Net Income Attributable to Noncontrolling Interests	2	2	5	5
Net Income (Loss) Attributable to Parent	272	215	481	475
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	1	1	2	2
Reclassification into earnings from cash flow hedges	2	1	3	(1)
Unrealized (losses) gains on available-for-sale securities		(1)	1	(1)
Other Comprehensive Income, net of tax	3	1	6
Comprehensive Income	277	218	492	480
Less: Comprehensive Income Attributable to Noncontrolling Interests	2	2	5	5
Comprehensive Income Attributable to Parent	275	216	487	475
Duke Energy Progress [Member]
Operating Revenues
Total operating revenues	1,213	1,193	2,520	2,642
Operating Expenses
Fuel used in electric generation and purchased power – regulated	424	449	872	1,024
Operation, maintenance and other	321	362	707	737
Depreciation and amortization	175	163	350	315
Property and other taxes	38	35	79	67
Total operating expenses	958	1,009	2,008	2,143
Gains on Sales of Other Assets and Other, net			1	1
Operating Income	255	184	513	500
Other Income and Expenses
Other income and expenses, net	12	15	29	35
Interest Expense	64	56	127	116
Income From Continuing Operations Before Income Taxes	203	143	415	419
Income Tax Expense from Continuing Operations	72	58	147	151
Net Income (Loss) Attributable to Parent	131	85	268	268
Duke Energy Florida [Member]
Operating Revenues
Total operating revenues	1,133	1,281	2,157	2,367
Operating Expenses
Fuel used in electric generation and purchased power – regulated	429	554	841	1,011
Operation, maintenance and other	199	202	404	390
Depreciation and amortization	122	122	236	256
Property and other taxes	82	88	160	168
Impairment charges	1		3
Total operating expenses	833	966	1,644	1,825
Operating Income	300	315	513	542
Other Income and Expenses
Other income and expenses, net	14	4	19	10
Interest Expense	40	50	81	99
Income From Continuing Operations Before Income Taxes	274	269	451	453
Income Tax Expense from Continuing Operations	103	104	170	175
Net Income (Loss) Attributable to Parent	171	165	281	278
Other Comprehensive Income (Loss), net of tax
Unrealized (losses) gains on available-for-sale securities			1
Other Comprehensive Income, net of tax			1
Comprehensive Income Attributable to Parent	171	165	282	278
Duke Energy Ohio [Member]
Operating Revenues
Regulated electric	323	299	663	638
Nonregulated electric and other	6	9	12	23
Regulated natural gas	99	97	269	330
Total operating revenues	428	405	944	991
Operating Expenses
Fuel used in electric generation and purchased power – regulated	100	107	211	222
Fuel used in electric generation and purchased power – nonregulated	13	12	23	26
Cost of natural gas	9	12	58	109
Operation, maintenance and other	122	118	241	246
Depreciation and amortization	64	58	125	115
Property and other taxes	65	57	136	127
Total operating expenses	373	364	794	845
Gains on Sales of Other Assets and Other, net		2	1	8
Operating Income	55	43	151	154
Other Income and Expenses
Other income and expenses, net	1	(5)	3	(2)
Interest Expense	21	18	41	38
Income From Continuing Operations Before Income Taxes	35	20	113	114
Income Tax Expense from Continuing Operations	12	7	33	42
Income from Continuing Operations	23	13	80	72
(Loss) Income From Discontinued Operations, net of tax		(65)	2	25
Net Income (Loss) Attributable to Parent	23	(52)	82	97
Duke Energy Indiana [Member]
Operating Revenues
Total operating revenues	702	686	1,416	1,474
Operating Expenses
Fuel used in electric generation and purchased power – regulated	220	235	448	529
Operation, maintenance and other	189	180	351	361
Depreciation and amortization	97	107	222	211
Property and other taxes	22	19	45	18
Total operating expenses	528	541	1,066	1,119
Gains on Sales of Other Assets and Other, net		1		1
Operating Income	174	146	350	356
Other Income and Expenses
Other income and expenses, net	6	4	10	9
Interest Expense	47	43	91	88
Income From Continuing Operations Before Income Taxes	133	107	269	277
Income Tax Expense from Continuing Operations	48	39	89	101
Net Income (Loss) Attributable to Parent	85	68	180	176
Other Comprehensive Income (Loss), net of tax
Reclassification into earnings from cash flow hedges			(1)	(1)
Other Comprehensive Income, net of tax			(1)	(1)
Comprehensive Income Attributable to Parent	$ 85	$ 68	$ 179	$ 175