Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating Revenues
Regulated electric		$ 5,258	$ 4,963	$ 10,477	$ 10,087
Regulated natural gas		302	263	1,051	901
Nonregulated electric and other		198	195	380	382
Total operating revenues		5,758	5,421	11,908	11,370
Operating Expenses
Operation, maintenance and other		1,410	1,353	2,812	2,692
Depreciation and amortization		1,207	1,150	2,433	2,280
Property and other taxes		349	334	702	679
Impairment of assets and other charges		131	6	131	8
Total operating expenses		4,591	4,251	9,291	8,713
Gains (Losses) on Sales of Other Assets and Other, net		2	7	2	8
Operating Income		1,169	1,177	2,619	2,665
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates		9	(1,968)	(8)	(1,924)
Other income and expenses, net		128	137	255	183
Total other income and expenses		137	(1,831)	247	(1,741)
Interest Expense		572	554	1,107	1,105
Income (Loss) Before Income Taxes		734	(1,208)	1,759	(181)
Income Tax Expense (Benefit)		36	(316)	120	(179)
Net Income (Loss)		698	(892)	1,639	(2)
Add: Net Loss Attributable to Noncontrolling Interests		67	90	118	138
Net Income and Comprehensive Income		765	(802)	1,757	136
Less: Preferred Dividends		14	15	53	54
Net Income (Loss) Available to Duke Energy Corporation Common Stockholders		751	(817)	1,704	82
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	[1]		(1)	2
Net unrealized (losses) gains on cash flow hedges	[1]	(97)	5	(68)	(76)
Unrealized gains (losses) on available-for-sale securities	[1]	4	6	(4)	7
Other Comprehensive (Loss) Income, net of tax	[1]	(89)	12	(63)	(65)
Comprehensive Income (Loss)		609	(880)	1,576	(67)
Comprehensive Income (Loss) Attributable to Duke Energy		$ 677	$ (792)	$ 1,688	$ 83
Net income (loss) attributable to Duke Energy Corporation common stockholders
Basic (in usd per share)		$ 0.96	$ (1.13)	$ 2.21	$ 0.11
Diluted (in usd per share)		$ 0.96	$ (1.13)	$ 2.21	$ 0.11
Weighted Average Shares Outstanding
Basic (in shares)		769	735	769	734
Diluted (in shares)		769	735	769	735
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	[1]	$ 4	$ 2	$ 7	$ 4
Duke Energy Carolinas
Operating Revenues
Total operating revenues		1,610	1,610	3,326	3,358
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		344	376	766	829
Operation, maintenance and other		435	430	876	816
Depreciation and amortization		363	375	722	718
Property and other taxes		74	75	157	156
Impairment of assets and other charges		75		75	2
Total operating expenses		1,291	1,256	2,596	2,521
Gains (Losses) on Sales of Other Assets and Other, net		2	(1)	2
Operating Income		321	353	732	837
Other Income and Expenses
Total other income and expenses		44	43	92	86
Interest Expense		139	125	263	248
Income (Loss) Before Income Taxes		226	271	561	675
Income Tax Expense (Benefit)		1	37	24	102
Net Income and Comprehensive Income		225	234	537	573
Progress Energy
Operating Revenues
Total operating revenues		2,679	2,498	5,184	4,920
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		833	777	1,628	1,540
Operation, maintenance and other		626	589	1,227	1,143
Depreciation and amortization		441	432	926	884
Property and other taxes		133	137	275	272
Impairment of assets and other charges		37		37
Total operating expenses		2,070	1,935	4,093	3,839
Gains (Losses) on Sales of Other Assets and Other, net		1	7	1	6
Operating Income		610	570	1,092	1,087
Other Income and Expenses
Total other income and expenses		38	33	81	65
Interest Expense		200	199	392	405
Income (Loss) Before Income Taxes		448	404	781	747
Income Tax Expense (Benefit)		37	60	80	120
Net Income (Loss)		411	344	701	627
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments		1	1	1	1
Net unrealized (losses) gains on cash flow hedges			1	1	2
Unrealized gains (losses) on available-for-sale securities		1	(1)
Other Comprehensive (Loss) Income, net of tax		2	1	2	3
Comprehensive Income (Loss)		413	345	703	630
Duke Energy Progress
Operating Revenues
Total operating revenues		1,349	1,243	2,750	2,581
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		409	395	845	800
Operation, maintenance and other		367	317	724	622
Depreciation and amortization		236	257	521	544
Property and other taxes		41	44	90	91
Impairment of assets and other charges		18		18
Total operating expenses		1,071	1,013	2,198	2,057
Gains (Losses) on Sales of Other Assets and Other, net		1	6	1	5
Operating Income		279	236	553	529
Other Income and Expenses
Total other income and expenses		20	19	44	41
Interest Expense		78	68	147	137
Income (Loss) Before Income Taxes		221	187	450	433
Income Tax Expense (Benefit)		6	26	25	68
Net Income and Comprehensive Income		215	161	425	365
Duke Energy Florida
Operating Revenues
Total operating revenues		1,325	1,250	2,426	2,330
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		424	382	783	740
Operation, maintenance and other		255	269	497	514
Depreciation and amortization		205	175	405	340
Property and other taxes		92	92	185	180
Impairment of assets and other charges		19		19
Total operating expenses		995	918	1,889	1,774
Operating Income		330	332	537	556
Other Income and Expenses
Total other income and expenses		18	15	36	25
Interest Expense		80	80	160	164
Income (Loss) Before Income Taxes		268	267	413	417
Income Tax Expense (Benefit)		51	51	79	81
Net Income and Comprehensive Income		217	216	334	336
Other Comprehensive Income (Loss), net of tax
Unrealized gains (losses) on available-for-sale securities		1	(1)
Other Comprehensive (Loss) Income, net of tax		1	(1)
Comprehensive Income (Loss) Attributable to Duke Energy		218	215	334	336
Duke Energy Ohio
Operating Revenues
Regulated electric		343	330	706	676
Regulated natural gas		113	93	282	245
Total operating revenues		456	423	988	921
Operating Expenses
Operation, maintenance and other		111	95	219	218
Depreciation and amortization		75	68	149	136
Property and other taxes		83	78	175	161
Impairment of assets and other charges		5		5
Total operating expenses		383	324	790	722
Operating Income		73	99	198	199
Other Income and Expenses
Total other income and expenses		5	4	10	7
Interest Expense		28	25	53	49
Income (Loss) Before Income Taxes		50	78	155	157
Income Tax Expense (Benefit)		11	12	25	26
Net Income and Comprehensive Income		39	66	130	131
Duke Energy Indiana
Operating Revenues
Total operating revenues		735	617	1,480	1,309
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		201	161	418	355
Operation, maintenance and other		192	171	370	357
Depreciation and amortization		152	134	304	266
Property and other taxes		20	20	41	42
Impairment of assets and other charges		8		8
Total operating expenses		573	486	1,141	1,020
Gains (Losses) on Sales of Other Assets and Other, net		(1)		(1)
Operating Income		161	131	338	289
Other Income and Expenses
Total other income and expenses		10	9	19	19
Interest Expense		49	42	99	85
Income (Loss) Before Income Taxes		122	98	258	223
Income Tax Expense (Benefit)		19	17	43	43
Net Income and Comprehensive Income		103	81	215	180
Piedmont
Operating Revenues
Total operating revenues		215	197	821	709
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		63	53	288	215
Operation, maintenance and other		76	79	154	159
Depreciation and amortization		51	43	99	88
Property and other taxes		14	12	28	24
Impairment of assets and other charges		5		5
Total operating expenses		209	187	574	486
Operating Income		6	10	247	223
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates				4	4
Total other income and expenses		18	16	35	28
Interest Expense		30	33	59	60
Income (Loss) Before Income Taxes		(6)	(7)	223	191
Income Tax Expense (Benefit)		(2)	(9)	24	11
Net Income and Comprehensive Income		(4)	2	199	180
Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,415	1,349	2,858	2,796
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		93	77	175	164
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		79	59	355	258
Cost of natural gas | Duke Energy Ohio
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 16	$ 6	$ 67	$ 43

[1] Net of income tax impacts of approximately $27 million for the three months ended June 30, 2021, and $19 million and $20 million for the six months ended June 30, 2021, and 2020, respectively. All other periods presented include immaterial income tax impacts.