Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Revenues
Regulated electric		$ 21,461	$ 22,615	$ 22,097
Regulated natural gas		1,642	1,759	1,773
Nonregulated electric and other		765	705	651
Total operating revenues		23,868	25,079	24,521
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		6,051	6,826	6,831
Operation, maintenance and other		5,788	6,066	6,463
Depreciation and amortization		4,705	4,548	4,074
Property and other taxes		1,337	1,307	1,280
Impairment charges		984	(8)	402
Total operating expenses		19,325	19,366	19,747
Gains (Losses) on Sales of Other Assets and Other, net		10	(4)	(89)
Operating Income		4,553	5,709	4,685
Other Income and Expenses
Equity in (losses) earnings of unconsolidated affiliates		(2,005)	162	83
Other income and expenses, net		453	430	399
Total other income and expenses		(1,552)	592	482
Interest Expense		2,162	2,204	2,094
Income From Continuing Operations Before Income Taxes		839	4,097	3,073
Income Tax (Benefit) Expense From Continuing Operations		(236)	519	448
Income From Continuing Operations		1,075	3,578	2,625
Income (Loss) From Discontinued Operations, net of tax		7	(7)	19
Net Income		1,082	3,571	2,644
Add: Net Loss Attributable to Noncontrolling Interests		295	177	22
Net Income Attributable to Parent		1,377	3,748	2,666
Less: Preferred Dividends		107	41
Net Income Available to Common Stockholders		1,270	3,707	2,666
Other Comprehensive Income, net of tax
Pension and OPEB adjustments	[1]	6	9	(6)
Net unrealized gain on cash flow hedges	[1]	(138)	(47)	(10)
Reclassification into earnings from cash flow hedges	[1]	11	6	6
Unrealized (losses) gains on available-for-sale securities	[1]	3	8	(3)
Other Comprehensive Loss, net of tax	[1]	(118)	(24)	(13)
Comprehensive Income		964	3,547	2,631
Add: Comprehensive Loss Attributable to Noncontrolling Interests		(306)	(177)	(22)
Comprehensive Income		$ 1,163	$ 3,683	$ 2,653
Income from continuing operations available to Duke Energy Corporation common stockholders
Basic and diluted (usd per share)		$ 1.71	$ 5.07	$ 3.73
Income (Loss) from discontinued operations attributable to Duke Energy Corporation common stockholders
Basic and diluted (usd per share)		0.01	(0.01)	0.03
Net income available to Duke Energy Corporation common stockholders
Basic and diluted (usd per share)		$ 1.72	$ 5.06	$ 3.76
Weighted average shares outstanding
Basic (in shares)		737	729	708
Diluted (in shares)		738	729	708
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 460	$ 627	$ 697
Duke Energy Carolinas
Operating Revenues
Total operating revenues		7,015	7,395	7,300
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,682	1,804	1,821
Operation, maintenance and other		1,743	1,868	2,130
Depreciation and amortization		1,462	1,388	1,201
Property and other taxes		299	292	295
Impairment charges		476	17	192
Total operating expenses		5,662	5,369	5,639
Gains (Losses) on Sales of Other Assets and Other, net		1		(1)
Operating Income		1,354	2,026	1,660
Other Income and Expenses
Other income and expenses, net		177	151	153
Total other income and expenses		177	151	153
Interest Expense		487	463	439
Income From Continuing Operations Before Income Taxes		1,044	1,714	1,374
Income Tax (Benefit) Expense From Continuing Operations		88	311	303
Net Income Attributable to Parent		956	1,403	1,071
Other Comprehensive Income, net of tax
Reclassification into earnings from cash flow hedges				1
Other Comprehensive Loss, net of tax				1
Comprehensive Income		956	1,403	1,072
Progress Energy
Operating Revenues
Total operating revenues		10,627	11,202	10,728
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		3,479	4,024	3,976
Operation, maintenance and other		2,479	2,495	2,613
Depreciation and amortization		1,818	1,845	1,619
Property and other taxes		545	561	529
Impairment charges		495	(24)	87
Total operating expenses		8,816	8,901	8,824
Gains (Losses) on Sales of Other Assets and Other, net		9		24
Operating Income		1,820	2,301	1,928
Other Income and Expenses
Other income and expenses, net		129	141	165
Total other income and expenses		129	141	165
Interest Expense		790	862	842
Income Before Income Taxes		1,159	1,580	1,251
Income Tax (Benefit) Expense From Continuing Operations		113	253	218
Net Income		1,046	1,327	1,033
Add: Net Loss Attributable to Noncontrolling Interests		1		6
Net Income Attributable to Parent		1,045	1,327	1,027
Other Comprehensive Income, net of tax
Pension and OPEB adjustments		(1)	2	5
Net unrealized gain on cash flow hedges		5	5	6
Unrealized (losses) gains on available-for-sale securities		(1)	1	(1)
Other Comprehensive Loss, net of tax		3	8	10
Comprehensive Income		1,049	1,335	1,043
Add: Comprehensive Loss Attributable to Noncontrolling Interests		1		6
Comprehensive Income		1,048	1,335	1,037
Duke Energy Progress
Operating Revenues
Total operating revenues		5,422	5,957	5,699
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,743	2,012	1,892
Operation, maintenance and other		1,332	1,446	1,578
Depreciation and amortization		1,116	1,143	991
Property and other taxes		167	176	155
Impairment charges		499	12	33
Total operating expenses		4,857	4,789	4,649
Gains (Losses) on Sales of Other Assets and Other, net		8		9
Operating Income		573	1,168	1,059
Other Income and Expenses
Other income and expenses, net		75	100	87
Total other income and expenses		75	100	87
Interest Expense		269	306	319
Income From Continuing Operations Before Income Taxes		379	962	827
Income Tax (Benefit) Expense From Continuing Operations		(36)	157	160
Net Income Attributable to Parent		415	805	667
Other Comprehensive Income, net of tax
Comprehensive Income		415	805	667
Duke Energy Florida
Operating Revenues
Total operating revenues		5,188	5,231	5,021
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,737	2,012	2,085
Operation, maintenance and other		1,131	1,034	1,025
Depreciation and amortization		702	702	628
Property and other taxes		381	392	374
Impairment charges		(4)	(36)	54
Total operating expenses		3,947	4,104	4,166
Gains (Losses) on Sales of Other Assets and Other, net		1		1
Operating Income		1,242	1,127	856
Other Income and Expenses
Other income and expenses, net		53	48	86
Total other income and expenses		53	48	86
Interest Expense		326	328	287
Income From Continuing Operations Before Income Taxes		969	847	655
Income Tax (Benefit) Expense From Continuing Operations		198	155	101
Net Income Attributable to Parent		771	692	554
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		770	693	553
Duke Energy Ohio
Operating Revenues
Regulated electric		1,405	1,456	1,450
Regulated natural gas		453	484	506
Nonregulated electric and other				1
Total operating revenues		1,858	1,940	1,957
Operating Expenses
Operation, maintenance and other		463	520	480
Depreciation and amortization		278	265	268
Property and other taxes		324	308	290
Total operating expenses		1,477	1,576	1,563
Gains (Losses) on Sales of Other Assets and Other, net				(106)
Operating Income		381	364	288
Other Income and Expenses
Other income and expenses, net		16	24	23
Total other income and expenses		16	24	23
Interest Expense		102	109	92
Income From Continuing Operations Before Income Taxes		295	279	219
Income Tax (Benefit) Expense From Continuing Operations		43	40	43
Income From Continuing Operations		252	239	176
Income (Loss) From Discontinued Operations, net of tax			(1)
Net Income Attributable to Parent		252	238	176
Other Comprehensive Income, net of tax
Comprehensive Income		252	238	176
Duke Energy Ohio | Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		73	95	113
Duke Energy Ohio | Electric Utilities and Infrastructure
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		339	388	412
Duke Energy Indiana
Operating Revenues
Total operating revenues		2,795	3,004	3,059
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		767	935	1,000
Operation, maintenance and other		762	790	788
Depreciation and amortization		569	525	520
Property and other taxes		81	69	78
Impairment charges				30
Total operating expenses		2,179	2,319	2,416
Operating Income		616	685	643
Other Income and Expenses
Other income and expenses, net		37	41	45
Total other income and expenses		37	41	45
Interest Expense		161	156	167
Income From Continuing Operations Before Income Taxes		492	570	521
Income Tax (Benefit) Expense From Continuing Operations		84	134	128
Net Income Attributable to Parent		408	436	393
Piedmont
Operating Revenues
Regulated natural gas		1,286	1,369	1,365
Nonregulated electric and other		11	12	10
Total operating revenues		1,297	1,381	1,375
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		386	532	584
Operation, maintenance and other		322	328	357
Depreciation and amortization		180	172	159
Property and other taxes		53	45	49
Impairment charges		7
Total operating expenses		948	1,077	1,149
Operating Income		349	304	226
Other Income and Expenses
Equity in (losses) earnings of unconsolidated affiliates		9	8	7
Other income and expenses, net		51	20	14
Total other income and expenses		60	28	21
Interest Expense		118	87	81
Income From Continuing Operations Before Income Taxes		291	245	166
Income Tax (Benefit) Expense From Continuing Operations		18	43	37
Net Income Attributable to Parent		273	202	129
Other Comprehensive Income, net of tax
Comprehensive Income		$ 273	$ 202	$ 129

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