Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Revenues
Regulated electric		$ 6,315	$ 6,515	$ 16,402	$ 17,223
Regulated natural gas		214	223	1,115	1,231
Nonregulated electric and other		192	202	574	522
Total operating revenues		6,721	6,940	18,091	18,976
Operating Expenses
Operation, maintenance and other		1,450	1,484	4,142	4,337
Depreciation and amortization		1,217	1,186	3,497	3,364
Property and other taxes		324	335	1,003	1,012
Impairment charges		28	(20)	36	(16)
Total operating expenses		4,909	5,011	13,622	14,376
Gains on Sales of Other Assets and Other, net		2		10
Operating Income		1,814	1,929	4,479	4,600
Other Income and Expenses
Equity in (losses) earnings of unconsolidated affiliates		(80)	50	(2,004)	137
Other income and expenses, net		127	104	310	308
Total other income and expenses		47	154	(1,694)	445
Interest Expense		522	572	1,627	1,657
Income Before Income Taxes		1,339	1,511	1,158	3,388
Income Tax Expense (Benefit)		105	188	(74)	424
Net Income		1,234	1,323	1,232	2,964
Less: Net Income Attributable to Noncontrolling Interests		(70)	(19)	(208)	(110)
Net income (attributable to parent)		1,304	1,342	1,440	3,074
Less: Preferred Dividends		39	15	93	27
Net Income Available to Duke Energy Corporation Common Stockholders		1,265	1,327	1,347	3,047
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	[1]	1	(2)	1	1
Net unrealized (losses) gains on cash flow hedges	[1]	(83)	(16)	(159)	(62)
Unrealized gains on available-for-sale securities	[1]	(2)	2	5	10
Other Comprehensive Loss, net of tax	[1]	(80)	(15)	(145)	(47)
Comprehensive Income		1,154	1,308	1,087	2,917
Less: Comprehensive Income Attributable to Noncontrolling Interests		(70)	(19)	(220)	(110)
Comprehensive Income Attributable to Duke Energy		$ 1,224	$ 1,327	$ 1,307	$ 3,027
Net income attributable to Duke Energy Corporation common stockholders
Basic and Diluted (in usd per share)		$ 1.74	$ 1.82	$ 1.85	$ 4.18
Weighted Average Shares Outstanding
Basic and Diluted (in shares)		735	729	735	728
Duke Energy Carolinas
Operating Revenues
Total operating revenues		$ 2,058	$ 2,162	$ 5,416	$ 5,619
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		497	504	1,326	1,371
Operation, maintenance and other		402	443	1,218	1,324
Depreciation and amortization		372	350	1,090	1,013
Property and other taxes		57	66	213	221
Impairment charges		20	6	22	11
Total operating expenses		1,348	1,369	3,869	3,940
Gains on Sales of Other Assets and Other, net		1		1
Operating Income		711	793	1,548	1,679
Other Income and Expenses
Total other income and expenses		42	34	128	106
Interest Expense		122	119	370	346
Income Before Income Taxes		631	708	1,306	1,439
Income Tax Expense (Benefit)		76	118	178	255
Net income (attributable to parent)		555	590	1,128	1,184
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy		555	590	1,128	1,184
Progress Energy
Operating Revenues
Total operating revenues		3,197	3,242	8,117	8,558
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,088	1,187	2,628	3,100
Operation, maintenance and other		646	640	1,789	1,813
Depreciation and amortization		472	496	1,356	1,377
Property and other taxes		147	159	419	439
Impairment charges		1	(25)	1	(25)
Total operating expenses		2,354	2,457	6,193	6,704
Gains on Sales of Other Assets and Other, net		3	1	9
Operating Income		846	786	1,933	1,854
Other Income and Expenses
Total other income and expenses		24	41	89	106
Interest Expense		194	212	599	650
Income Before Income Taxes		676	615	1,423	1,310
Income Tax Expense (Benefit)		70	94	190	212
Net Income		606	521	1,233	1,098
Less: Net Income Attributable to Noncontrolling Interests		1	0	1	0
Net income (attributable to parent)		605	521	1,232	1,098
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments				1	2
Net unrealized (losses) gains on cash flow hedges		1	1	3	4
Unrealized gains on available-for-sale securities		1	1	1	2
Other Comprehensive Loss, net of tax		2	2	5	8
Comprehensive Income		608	523	1,238	1,106
Less: Comprehensive Income Attributable to Noncontrolling Interests		1		1	0
Comprehensive Income Attributable to Duke Energy		607	523	1,237	1,106
Duke Energy Progress
Operating Revenues
Total operating revenues		1,626	1,688	4,207	4,559
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		537	577	1,337	1,571
Operation, maintenance and other		348	378	970	1,070
Depreciation and amortization		289	314	833	855
Property and other taxes		38	46	129	131
Impairment charges		5		5
Total operating expenses		1,217	1,315	3,274	3,627
Gains on Sales of Other Assets and Other, net		3		8
Operating Income		412	373	941	932
Other Income and Expenses
Total other income and expenses		11	27	52	75
Interest Expense		66	74	203	232
Income Before Income Taxes		357	326	790	775
Income Tax Expense (Benefit)		11	48	79	125
Net income (attributable to parent)		346	278	711	650
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy		346	278	711	650
Duke Energy Florida
Operating Revenues
Total operating revenues		1,567	1,548	3,897	3,987
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		551	610	1,291	1,529
Operation, maintenance and other		292	256	806	730
Depreciation and amortization		183	182	523	522
Property and other taxes		110	113	290	309
Impairment charges		(4)	(25)	(4)	(25)
Total operating expenses		1,132	1,136	2,906	3,065
Gains on Sales of Other Assets and Other, net			1
Operating Income		435	413	991	922
Other Income and Expenses
Total other income and expenses		11	14	36	39
Interest Expense		81	81	245	246
Income Before Income Taxes		365	346	782	715
Income Tax Expense (Benefit)		78	57	159	129
Net income (attributable to parent)		287	289	623	586
Other Comprehensive Income (Loss), net of tax
Unrealized gains on available-for-sale securities		1	1	1	2
Other Comprehensive Loss, net of tax		1	1	1	2
Comprehensive Income Attributable to Duke Energy		288	290	624	588
Duke Energy Ohio
Operating Revenues
Regulated electric		394	408	1,070	1,099
Regulated natural gas		79	81	324	354
Total operating revenues		473	489	1,394	1,453
Operating Expenses
Operation, maintenance and other		115	123	333	378
Depreciation and amortization		72	69	208	199
Property and other taxes		83	71	244	229
Total operating expenses		367	381	1,089	1,167
Operating Income		106	108	305	286
Other Income and Expenses
Total other income and expenses		4	4	11	19
Interest Expense		26	27	75	81
Income Before Income Taxes		84	85	241	224
Income Tax Expense (Benefit)		14	11	40	34
Net income (attributable to parent)		70	74	201	190
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy		70	74	201	190
Duke Energy Indiana
Operating Revenues
Total operating revenues		761	807	2,070	2,289
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		222	234	577	720
Operation, maintenance and other		207	192	564	569
Depreciation and amortization		149	130	415	393
Property and other taxes		15	16	57	55
Total operating expenses		593	572	1,613	1,737
Operating Income		168	235	457	552
Other Income and Expenses
Total other income and expenses		9	8	28	35
Interest Expense		29	40	114	111
Income Before Income Taxes		148	203	371	476
Income Tax Expense (Benefit)		29	47	72	113
Net income (attributable to parent)		119	156	299	363
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy		119	156	299	363
Piedmont Natural Gas
Operating Revenues
Total operating revenues		162	168	871	956
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		39	46	254	384
Operation, maintenance and other		75	78	234	241
Depreciation and amortization		45	43	133	127
Property and other taxes		13	14	37	39
Impairment charges		7		7
Total operating expenses		179	181	665	791
Operating Income		(17)	(13)	206	165
Other Income and Expenses
Equity in (losses) earnings of unconsolidated affiliates				7	6
Total other income and expenses		16	7	44	19
Interest Expense		29	22	89	65
Income Before Income Taxes		(30)	(28)	161	119
Income Tax Expense (Benefit)		(5)	(10)	6	22
Net income (attributable to parent)		(25)	(18)	155	97
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy		(25)	(18)	155	97
Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,849	1,978	4,645	5,228
Fuel used in electric generation and purchased power | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		94	114	258	293
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		41	48	299	451
Cost of natural gas | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 3	$ 4	$ 46	$ 68

[1] Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020, and $43 million and $14 million for the nine months ended September 30, 2020, and 2019, respectively. All other periods presented include immaterial income tax impacts.