Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Revenues
Regulated electric		$ 22,319	$ 21,461	$ 22,615
Regulated natural gas		2,008	1,642	1,759
Nonregulated electric and other		770	765	705
Total operating revenues		25,097	23,868	25,079
Operating Expenses
Operation, maintenance and other		6,042	5,788	6,066
Depreciation and amortization		4,990	4,705	4,548
Property and other taxes		1,389	1,337	1,307
Impairment of assets and other charges		356	984	(8)
Total operating expenses		19,737	19,325	19,366
Gains (Losses) on Sales of Other Assets and Other, net		13	10	(4)
Operating Income		5,373	4,553	5,709
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates		28	(2,005)	162
Other income and expenses, net		643	453	430
Total other income and expenses		671	(1,552)	592
Interest Expense		2,280	2,162	2,204
Income From Continuing Operations Before Income Taxes		3,764	839	4,097
Income Tax Expense (Benefit) From Continuing Operations		192	(236)	519
Income From Continuing Operations		3,572	1,075	3,578
Income (Loss) From Discontinued Operations, net of tax		7	7	(7)
Net Income		3,579	1,082	3,571
Add: Net Loss Attributable to Noncontrolling Interests		329	295	177
Net Income Attributable to Parent		3,908	1,377	3,748
Less: Preferred Dividends		106	107	41
Net Income Available to Common Stockholders		3,802	1,270	3,707
Other Comprehensive Income, net of tax
Pension and OPEB adjustments	[1]	7	6	9
Net unrealized gain on cash flow hedges	[1]	(68)	(138)	(47)
Unrealized (losses) gains on available-for-sale securities	[1]	(8)	3	8
Other Comprehensive Loss, net of tax	[1]	(56)	(118)	(24)
Comprehensive Income		3,523	964	3,547
Add: Comprehensive Loss Attributable to Noncontrolling Interests		(319)	(306)	(177)
Comprehensive Income Attributable to Duke Energy Corporation		$ 3,842	$ 1,270	$ 3,724
Income from continuing operations available to Duke Energy Corporation common stockholders
Basic (usd per share)		$ 4.93	$ 1.71	$ 5.07
Diluted (usd per share)		4.93	1.71	5.07
Income (Loss) from discontinued operations attributable to Duke Energy Corporation common stockholders
Basic (usd per share)		0.01	0.01	(0.01)
Diluted (usd per share)		0.01	0.01	(0.01)
Net income available to Duke Energy Corporation common stockholders
Basic (usd per share)		4.94	1.72	5.06
Diluted (usd per share)		$ 4.94	$ 1.72	$ 5.06
Weighted average shares outstanding
Basic (in shares)		769	737	729
Diluted (in shares)		769	738	729
Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 6,255	$ 6,051	$ 6,826
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		705	460	627
Duke Energy Carolinas
Operating Revenues
Total operating revenues		7,102	7,015	7,395
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,601	1,682	1,804
Operation, maintenance and other		1,833	1,743	1,868
Depreciation and amortization		1,468	1,462	1,388
Property and other taxes		320	299	292
Impairment of assets and other charges		227	476	17
Total operating expenses		5,449	5,662	5,369
Gains (Losses) on Sales of Other Assets and Other, net		2	1
Operating Income		1,655	1,354	2,026
Other Income and Expenses
Other income and expenses, net		270	177	151
Total other income and expenses		270	177	151
Interest Expense		538	487	463
Income From Continuing Operations Before Income Taxes		1,387	1,044	1,714
Income Tax Expense (Benefit) From Continuing Operations		51	88	311
Net Income Attributable to Parent		1,336	956	1,403
Other Comprehensive Income, net of tax
Net unrealized gain on cash flow hedges		1
Other Comprehensive Loss, net of tax		1
Comprehensive Income Attributable to Duke Energy Corporation		1,337	956	1,403
Progress Energy
Operating Revenues
Total operating revenues		11,057	10,627	11,202
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		3,584	3,479	4,024
Operation, maintenance and other		2,529	2,479	2,495
Depreciation and amortization		1,929	1,818	1,845
Property and other taxes		542	545	561
Impairment of assets and other charges		82	495	(24)
Total operating expenses		8,666	8,816	8,901
Gains (Losses) on Sales of Other Assets and Other, net		14	9
Operating Income		2,405	1,820	2,301
Other Income and Expenses
Other income and expenses, net		215	129	141
Total other income and expenses		215	129	141
Interest Expense		794	790	862
Income Before Income Taxes		1,826	1,159	1,580
Income Tax Expense (Benefit) From Continuing Operations		227	113	253
Net Income		1,599	1,046	1,327
Add: Net Loss Attributable to Noncontrolling Interests		(1)	(1)
Net Income Attributable to Parent		1,598	1,045	1,327
Other Comprehensive Income, net of tax
Pension and OPEB adjustments		1	(1)	2
Net unrealized gain on cash flow hedges		3	5	5
Unrealized (losses) gains on available-for-sale securities			(1)	1
Other Comprehensive Loss, net of tax		4	3	8
Comprehensive Income		1,603	1,049	1,335
Add: Comprehensive Loss Attributable to Noncontrolling Interests		1	1
Comprehensive Income Attributable to Duke Energy Corporation		1,602	1,048	1,335
Duke Energy Progress
Operating Revenues
Total operating revenues		5,780	5,422	5,957
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,778	1,743	2,012
Operation, maintenance and other		1,467	1,332	1,446
Depreciation and amortization		1,097	1,116	1,143
Property and other taxes		159	167	176
Impairment of assets and other charges		63	499	12
Total operating expenses		4,564	4,857	4,789
Gains (Losses) on Sales of Other Assets and Other, net		13	8
Operating Income		1,229	573	1,168
Other Income and Expenses
Other income and expenses, net		143	75	100
Total other income and expenses		143	75	100
Interest Expense		306	269	306
Income From Continuing Operations Before Income Taxes		1,066	379	962
Income Tax Expense (Benefit) From Continuing Operations		75	(36)	157
Net Income Attributable to Parent		991	415	805
Other Comprehensive Income, net of tax
Comprehensive Income Attributable to Duke Energy Corporation		991	415	805
Duke Energy Florida
Operating Revenues
Total operating revenues		5,259	5,188	5,231
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,806	1,737	2,012
Operation, maintenance and other		1,048	1,131	1,034
Depreciation and amortization		831	702	702
Property and other taxes		383	381	392
Impairment of assets and other charges		19	(4)	(36)
Total operating expenses		4,087	3,947	4,104
Gains (Losses) on Sales of Other Assets and Other, net		1	1
Operating Income		1,173	1,242	1,127
Other Income and Expenses
Other income and expenses, net		71	53	48
Total other income and expenses		71	53	48
Interest Expense		319	326	328
Income From Continuing Operations Before Income Taxes		925	969	847
Income Tax Expense (Benefit) From Continuing Operations		187	198	155
Net Income Attributable to Parent		738	771	692
Other Comprehensive Income, net of tax
Unrealized (losses) gains on available-for-sale securities		(1)	(1)	1
Other Comprehensive Loss, net of tax		(1)	(1)	1
Comprehensive Income Attributable to Duke Energy Corporation		737	770	693
Duke Energy Ohio
Operating Revenues
Regulated electric		1,493	1,405	1,456
Regulated natural gas		544	453	484
Total operating revenues		2,037	1,858	1,940
Operating Expenses
Operation, maintenance and other		479	463	520
Depreciation and amortization		307	278	265
Property and other taxes		355	324	308
Impairment of assets and other charges		25
Total operating expenses		1,711	1,477	1,576
Gains (Losses) on Sales of Other Assets and Other, net		1
Operating Income		327	381	364
Other Income and Expenses
Other income and expenses, net		18	16	24
Total other income and expenses		18	16	24
Interest Expense		111	102	109
Income From Continuing Operations Before Income Taxes		234	295	279
Income Tax Expense (Benefit) From Continuing Operations		30	43	40
Income From Continuing Operations		204	252	239
Income (Loss) From Discontinued Operations, net of tax				(1)
Net Income Attributable to Parent		204	252	238
Other Comprehensive Income, net of tax
Comprehensive Income Attributable to Duke Energy Corporation		204	252	238
Duke Energy Ohio | Fuel used in electric generation and purchased power
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		409	339	388
Duke Energy Ohio | Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		136	73	95
Duke Energy Indiana
Operating Revenues
Total operating revenues		3,174	2,795	3,004
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		985	767	935
Operation, maintenance and other		750	762	790
Depreciation and amortization		615	569	525
Property and other taxes		73	81	69
Impairment of assets and other charges		9
Total operating expenses		2,432	2,179	2,319
Operating Income		742	616	685
Other Income and Expenses
Other income and expenses, net		42	37	41
Total other income and expenses		42	37	41
Interest Expense		196	161	156
Income From Continuing Operations Before Income Taxes		588	492	570
Income Tax Expense (Benefit) From Continuing Operations		107	84	134
Net Income Attributable to Parent		481	408	436
Other Comprehensive Income, net of tax
Comprehensive Income Attributable to Duke Energy Corporation		481	408	436
Piedmont
Operating Revenues
Regulated natural gas		1,555	1,286	1,369
Nonregulated electric and other		14	11	12
Total operating revenues		1,569	1,297	1,381
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		569	386	532
Operation, maintenance and other		327	322	328
Depreciation and amortization		213	180	172
Property and other taxes		55	53	45
Impairment of assets and other charges		10	7
Total operating expenses		1,174	948	1,077
Operating Income		395	349	304
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates		9	9	8
Other income and expenses, net		55	51	20
Total other income and expenses		64	60	28
Interest Expense		119	118	87
Income From Continuing Operations Before Income Taxes		340	291	245
Income Tax Expense (Benefit) From Continuing Operations		30	18	43
Net Income Attributable to Parent		310	273	202
Other Comprehensive Income, net of tax
Comprehensive Income Attributable to Duke Energy Corporation		$ 310	$ 273	$ 202

[1] Net of income tax impacts of approximately $17 million and $35 million for the years ended December 31, 2021, and 2020, respectively. Tax impacts are immaterial for other periods presented.