Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Revenues
Regulated electric	$ 5,423	$ 5,178	$ 10,708	$ 10,462
Regulated natural gas	280	291	1,008	991
Nonregulated electric and other	170	174	320	325
Total operating revenues	5,873	5,643	12,036	11,778
Operating Expenses
Operation, maintenance and other	1,434	1,544	2,853	3,008
Depreciation and amortization	1,089	973	2,178	1,940
Property and other taxes	334	315	677	631
Impairment charges	4	172	4	215
Total operating expenses	4,578	4,667	9,365	9,446
Gains (Losses) on Sales of Other Assets and Other, net	3	3		(97)
Operating Income	1,298	979	2,671	2,235
Other Income and Expenses
Equity in earnings of unconsolidated affiliates	44	36	87	12
Other income and expenses, net	89	110	204	196
Total other income and expenses	133	146	291	208
Interest Expense	542	518	1,085	1,033
Income From Continuing Operations Before Income Taxes	889	607	1,877	1,410
Income Tax Expense From Continuing Operations	141	100	236	281
Income From Continuing Operations	748	507	1,641	1,129
Loss From Discontinued Operations, net of tax		(5)	0	(5)
Net Income	748	502	1,641	1,124
Less: Net (Loss) Income Attributable to Noncontrolling Interests	(84)	2	(91)	4
Less: Preferred Dividends	12		12
Net Income Attributable to Duke Energy Corporation	820	500	1,720	1,120
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	3	1	3	2
Reclassification into earnings from cash flow hedges	2	(2)	3	(1)
Unrealized gains (losses) on available-for-sale securities	4	(2)	8	(5)
Other Comprehensive (Loss) Income, net of tax	(20)	(2)	(32)	9
Comprehensive Income	728	500	1,609	1,133
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(84)	2	(91)	4
Comprehensive Income Attributable to Duke Energy Corporation	$ 800	$ 498	$ 1,688	$ 1,129
Net income attributable to Duke Energy Corporation common stockholders
Continuing Operations, Basic and Diluted (in usd per share)	$ 1.12	$ 0.72	$ 2.36	$ 1.60
Discontinued Operations, Basic and Diluted (in usd per share)		(0.01)		(0.01)
Basic and Diluted (in usd per share)	$ 1.12	$ 0.71	$ 2.36	$ 1.59
Weighted average shares outstanding
Weighted Average Number of Shares Outstanding, Basic	728	703	728	702
Weighted Average Number of Shares Outstanding, Diluted	728	704	728	702
Duke Energy Carolinas [Member]
Operating Revenues
Total operating revenues	$ 1,713	$ 1,672	$ 3,457	$ 3,435
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	395	407	867	880
Operation, maintenance and other	441	499	881	950
Depreciation and amortization	346	289	663	561
Property and other taxes	75	75	155	147
Impairment charges	5	177	5	190
Total operating expenses	1,262	1,447	2,571	2,728
Gains (Losses) on Sales of Other Assets and Other, net		(1)		(1)
Operating Income	451	224	886	706
Other Income and Expenses
Total other income and expenses	41	35	72	74
Interest Expense	117	110	227	217
Income From Continuing Operations Before Income Taxes	375	149	731	563
Income Tax Expense From Continuing Operations	74	32	137	123
Net Income Attributable to Duke Energy Corporation	301	117	594	440
Other Comprehensive Income (Loss), net of tax
Reclassification into earnings from cash flow hedges				1
Other Comprehensive (Loss) Income, net of tax				1
Comprehensive Income Attributable to Duke Energy Corporation	301	117	594	441
Progress Energy [Member]
Operating Revenues
Total operating revenues	2,744	2,498	5,316	5,074
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	988	895	1,913	1,871
Operation, maintenance and other	606	610	1,173	1,233
Depreciation and amortization	426	380	881	764
Property and other taxes	143	131	280	254
Impairment charges		4		33
Total operating expenses	2,163	2,020	4,247	4,155
Gains (Losses) on Sales of Other Assets and Other, net	(1)	6	(1)	12
Operating Income	580	484	1,068	931
Other Income and Expenses
Total other income and expenses	34	42	65	77
Interest Expense	219	203	438	412
Income From Continuing Operations Before Income Taxes	395	323	695	596
Income Tax Expense From Continuing Operations	66	56	118	92
Net Income	329	267	577	504
Less: Net (Loss) Income Attributable to Noncontrolling Interests	1	2	0	4
Net Income Attributable to Duke Energy Corporation	328	265	577	500
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	1	2	2	2
Reclassification into earnings from cash flow hedges	(1)	(1)	(3)	(3)
Unrealized gains (losses) on available-for-sale securities	1	(1)	1	(1)
Other Comprehensive (Loss) Income, net of tax	3	2	6	4
Comprehensive Income	332	269	583	508
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests	1	2		4
Comprehensive Income Attributable to Duke Energy Corporation	331	267	583	504
Duke Energy Progress [Member]
Operating Revenues
Total operating revenues	1,387	1,291	2,871	2,751
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	479	408	994	917
Operation, maintenance and other	357	375	692	756
Depreciation and amortization	251	235	541	470
Property and other taxes	41	40	85	75
Impairment charges		1		33
Total operating expenses	1,128	1,059	2,312	2,251
Gains (Losses) on Sales of Other Assets and Other, net		1		2
Operating Income	259	233	559	502
Other Income and Expenses
Total other income and expenses	24	19	48	37
Interest Expense	81	78	158	159
Income From Continuing Operations Before Income Taxes	202	174	449	380
Income Tax Expense From Continuing Operations	33	35	77	64
Net Income Attributable to Duke Energy Corporation	169	139	372	316
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy Corporation			372	316
Duke Energy Florida [Member]
Operating Revenues
Total operating revenues	1,353	1,203	2,439	2,318
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	509	486	919	953
Operation, maintenance and other	244	237	474	474
Depreciation and amortization	175	144	340	294
Property and other taxes	103	91	196	179
Total operating expenses	1,031	958	1,929	1,900
Gains (Losses) on Sales of Other Assets and Other, net	(1)		(1)
Operating Income	321	245	509	418
Other Income and Expenses
Total other income and expenses	12	26	25	47
Interest Expense	83	66	165	137
Income From Continuing Operations Before Income Taxes	250	205	369	328
Income Tax Expense From Continuing Operations	49	37	72	57
Net Income Attributable to Duke Energy Corporation	201	168	297	271
Other Comprehensive Income (Loss), net of tax
Unrealized gains (losses) on available-for-sale securities		(1)	1	(1)
Other Comprehensive (Loss) Income, net of tax		(1)	1	(1)
Comprehensive Income Attributable to Duke Energy Corporation	201	167	298	270
Duke Energy Ohio [Member]
Operating Revenues
Regulated electric	336	346	691	682
Regulated natural gas	97	103	273	277
Nonregulated electric and other		10		24
Total operating revenues	433	459	964	983
Operating Expenses
Operation, maintenance and other	123	130	255	261
Depreciation and amortization	66	62	130	132
Property and other taxes	74	68	158	145
Total operating expenses	359	382	786	821
Gains (Losses) on Sales of Other Assets and Other, net				(106)
Operating Income	74	77	178	56
Other Income and Expenses
Total other income and expenses	6	8	15	14
Interest Expense	24	23	54	45
Income From Continuing Operations Before Income Taxes	56	62	139	25
Income Tax Expense From Continuing Operations	9	16	23	4
Net Income Attributable to Duke Energy Corporation	47	46	116	21
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy Corporation			116	21
Duke Energy Indiana [Member]
Operating Revenues
Total operating revenues	714	738	1,482	1,469
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	229	226	486	458
Operation, maintenance and other	188	197	377	378
Depreciation and amortization	132	126	263	256
Property and other taxes	20	20	39	40
Total operating expenses	569	569	1,165	1,132
Gains (Losses) on Sales of Other Assets and Other, net	3
Operating Income	148	169	317	337
Other Income and Expenses
Total other income and expenses	8	6	27	13
Interest Expense	28	43	71	83
Income From Continuing Operations Before Income Taxes	128	132	273	267
Income Tax Expense From Continuing Operations	31	34	66	69
Net Income Attributable to Duke Energy Corporation	97	98	207	198
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy Corporation			207	198
Piedmont Natural Gas [Member]
Operating Revenues
Total operating revenues	209	215	788	768
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	65	74	338	333
Operation, maintenance and other	83	85	163	167
Depreciation and amortization	42	39	84	78
Property and other taxes	13	12	25	24
Total operating expenses	203	210	610	602
Operating Income	6	5	178	166
Other Income and Expenses
Equity in earnings of unconsolidated affiliates			4	3
Total other income and expenses	6	4	12	9
Interest Expense	21	20	43	41
Income From Continuing Operations Before Income Taxes	(9)	(11)	147	134
Income Tax Expense From Continuing Operations	(2)	(3)	32	32
Net Income Attributable to Duke Energy Corporation	(7)	(8)	115	102
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy Corporation			115	102
Electricity, US Regulated [Member] | Duke Energy Ohio [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	86	93	179	185
Electricity, Nonregulated [Member] | Duke Energy Ohio [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		14		29
Electricity [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	1,641	1,574	3,250	3,250
Natural Gas [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	76	89	403	402
Natural Gas [Member] | Duke Energy Ohio [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	$ 10	$ 15	$ 64	$ 69