Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Revenues
Regulated electric		$ 22,615	$ 22,097	$ 21,177
Regulated natural gas		1,759	1,773	1,734
Nonregulated electric and other		705	651	654
Total operating revenues		25,079	24,521	23,565
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		6,826	6,831	6,350
Operation, maintenance and other		6,066	6,463	5,944
Depreciation and amortization		4,548	4,074	3,527
Property and other taxes		1,307	1,280	1,233
Impairment charges		(8)	402	282
Total operating expenses		19,366	19,747	17,968
(Losses) Gains on Sales of Other Assets and Other, net		(4)	(89)	28
Operating Income		5,709	4,685	5,625
Other Income and Expenses
Equity in earnings of unconsolidated affiliates		162	83	119
Other income and expenses, net		430	399	508
Total other income and expenses		592	482	627
Interest Expense		2,204	2,094	1,986
Income (Loss) from Continuing Operations before Income Taxes		4,097	3,073	4,266
Income Tax Expense From Continuing Operations		519	448	1,196
Income From Continuing Operations		3,578	2,625	3,070
(Loss) Income From Discontinued Operations, net of tax		(7)	19	(6)
Net Income		3,571	2,644	3,064
Less: Net (Loss) Income Attributable to Noncontrolling Interests		(177)	(22)	5
Net Income Attributable to Parent		3,748	2,666	3,059
Less: Preferred Dividends		41
Net Income Available to Common Stockholders		3,707	2,666	3,059
Other Comprehensive (Loss) Income, net of tax(a)
Pension and OPEB adjustments	[1]	9	(6)	3
Net unrealized (losses) gains on cash flow hedges	[1]	(47)	(10)
Net unrealized gain on cash flow hedges	[1]			2
Reclassification into earnings from cash flow hedges	[1]	6	6
Reclassification into earnings from cash flow hedges	[1]			8
Unrealized gains on available for sale securities	[1]	8	(3)	13
Other Comprehensive (Loss) Income, net of tax	[1]	(24)	(13)	26
Comprehensive Income		3,547	2,631	3,090
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests		(177)	(22)	5
Comprehensive (Loss) Income Attributable to Parent		$ 3,683	$ 2,653	$ 3,085
Income from continuing operations available to Duke Energy Corporation common stockholders
Basic and diluted (in usd per share)		$ 5.07	$ 3.73	$ 4.37
(Loss) Income from discontinued operations attributable to Duke Energy Corporation common stockholders
Basic and diluted (in usd per share)		(0.01)	0.03	(0.01)
Net income available to Duke Energy Corporation common stockholders
Basic and diluted (in usd per share)		$ 5.06	$ 3.76	$ 4.36
Weighted average shares outstanding
Weighted average common shares outstanding – basic and diluted		729	708	700
Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 627	$ 697	$ 632
Duke Energy Carolinas
Operating Revenues
Total operating revenues		7,395	7,300	7,302
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,804	1,821	1,822
Operation, maintenance and other		1,868	2,130	2,021
Depreciation and amortization		1,388	1,201	1,090
Property and other taxes		292	295	281
Impairment charges		17	192	0
Total operating expenses		5,369	5,639	5,214
(Losses) Gains on Sales of Other Assets and Other, net			(1)	1
Operating Income		2,026	1,660	2,089
Other Income and Expenses
Other income and expenses, net		151	153	199
Total other income and expenses		151	153	199
Interest Expense		463	439	422
Income (Loss) from Continuing Operations before Income Taxes		1,714	1,374	1,866
Income Tax Expense From Continuing Operations		311	303	652
Net Income Attributable to Parent		1,403	1,071	1,214
Other Comprehensive (Loss) Income, net of tax(a)
Reclassification into earnings from cash flow hedges			1
Reclassification into earnings from cash flow hedges				2
Other Comprehensive (Loss) Income, net of tax			1	2
Comprehensive (Loss) Income Attributable to Parent		1,403	1,072	1,216
Progress Energy
Operating Revenues
Total operating revenues		11,202	10,728	9,783
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		4,024	3,976	3,417
Operation, maintenance and other		2,495	2,613	2,301
Depreciation and amortization		1,845	1,619	1,285
Property and other taxes		561	529	503
Impairment charges		(24)	87	156
Total operating expenses		8,901	8,824	7,662
(Losses) Gains on Sales of Other Assets and Other, net			24	26
Operating Income		2,301	1,928	2,147
Other Income and Expenses
Other income and expenses, net		141	165	209
Total other income and expenses		141	165	209
Interest Expense		862	842	824
Income From Continuing Operations Before Income Taxes		1,580	1,251	1,532
Income Tax Expense From Continuing Operations		253	218	264
Net Income		1,327	1,033	1,268
Less: Net (Loss) Income Attributable to Noncontrolling Interests			6	10
Net Income Attributable to Parent		1,327	1,027	1,258
Other Comprehensive (Loss) Income, net of tax(a)
Pension and OPEB adjustments		2	5	4
Net unrealized (losses) gains on cash flow hedges		5	6
Net unrealized gain on cash flow hedges				5
Unrealized gains on available for sale securities		1	(1)	4
Other Comprehensive (Loss) Income, net of tax		8	10	13
Comprehensive Income		1,335	1,043	1,281
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests			6	10
Comprehensive (Loss) Income Attributable to Parent		1,335	1,037	1,271
Duke Energy Progress
Operating Revenues
Total operating revenues		5,957	5,699	5,129
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		2,012	1,892	1,609
Operation, maintenance and other		1,446	1,578	1,439
Depreciation and amortization		1,143	991	725
Property and other taxes		176	155	156
Impairment charges		12	33	19
Total operating expenses		4,789	4,649	3,948
(Losses) Gains on Sales of Other Assets and Other, net			9	4
Operating Income		1,168	1,059	1,185
Other Income and Expenses
Other income and expenses, net		100	87	115
Total other income and expenses		100	87	115
Interest Expense		306	319	293
Income (Loss) from Continuing Operations before Income Taxes		962	827	1,007
Income Tax Expense From Continuing Operations		157	160	292
Net Income Attributable to Parent		805	667	715
Other Comprehensive (Loss) Income, net of tax(a)
Comprehensive (Loss) Income Attributable to Parent		805	667	715
Duke Energy Florida
Operating Revenues
Total operating revenues		5,231	5,021	4,646
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		2,012	2,085	1,808
Operation, maintenance and other		1,034	1,025	853
Depreciation and amortization		702	628	560
Property and other taxes		392	374	347
Impairment charges		(36)	54	138
Total operating expenses		4,104	4,166	3,706
(Losses) Gains on Sales of Other Assets and Other, net			1	1
Operating Income		1,127	856	941
Other Income and Expenses
Other income and expenses, net		48	86	96
Total other income and expenses		48	86	96
Interest Expense		328	287	279
Income (Loss) from Continuing Operations before Income Taxes		847	655	758
Income Tax Expense From Continuing Operations		155	101	46
Net Income Attributable to Parent		692	554	712
Other Comprehensive (Loss) Income, net of tax(a)
Unrealized gains on available for sale securities		1	(1)	3
Other Comprehensive (Loss) Income, net of tax		1	(1)	3
Comprehensive (Loss) Income Attributable to Parent		693	553	715
Duke Energy Ohio
Operating Revenues
Regulated electric		1,456	1,450	1,373
Regulated natural gas		484	506	508
Nonregulated electric and other			1	42
Total operating revenues		1,940	1,957	1,923
Operating Expenses
Operation, maintenance and other		520	480	530
Depreciation and amortization		265	268	261
Property and other taxes		308	290	278
Impairment charges				1
Total operating expenses		1,576	1,563	1,604
(Losses) Gains on Sales of Other Assets and Other, net			(106)	1
Operating Income		364	288	320
Other Income and Expenses
Other income and expenses, net		24	23	23
Total other income and expenses		24	23	23
Interest Expense		109	92	91
Income (Loss) from Continuing Operations before Income Taxes		279	219	252
Income Tax Expense From Continuing Operations		40	43	59
Income From Continuing Operations		239	176	193
(Loss) Income From Discontinued Operations, net of tax		(1)		(1)
Net Income Attributable to Parent		238	176	192
Other Comprehensive (Loss) Income, net of tax(a)
Comprehensive (Loss) Income Attributable to Parent		238	176	192
Duke Energy Ohio | Cost of natural gas
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		95	113	107
Duke Energy Ohio | Electric Utilities and Infrastructure
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		388	412	369
Duke Energy Ohio | Electricity, Nonregulated
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas				58
Duke Energy Indiana
Operating Revenues
Total operating revenues		3,004	3,059	3,047
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		935	1,000	966
Operation, maintenance and other		790	788	743
Depreciation and amortization		525	520	458
Property and other taxes		69	78	76
Impairment charges			30	18
Total operating expenses		2,319	2,416	2,261
Operating Income		685	643	786
Other Income and Expenses
Other income and expenses, net		41	45	47
Total other income and expenses		41	45	47
Interest Expense		156	167	178
Income (Loss) from Continuing Operations before Income Taxes		570	521	655
Income Tax Expense From Continuing Operations		134	128	301
Net Income Attributable to Parent		436	393	354
Piedmont
Operating Revenues
Regulated natural gas		1,369	1,365	1,319
Nonregulated electric and other		12	10	9
Total operating revenues		1,381	1,375	1,328
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		532	584	524
Operation, maintenance and other		328	357	304
Depreciation and amortization		172	159	148
Property and other taxes		45	49	48
Impairment charges				7
Total operating expenses		1,077	1,149	1,031
Operating Income		304	226	297
Other Income and Expenses
Equity in earnings of unconsolidated affiliates		8	7	(6)
Other income and expenses, net		20	14	(11)
Total other income and expenses		28	21	(17)
Interest Expense		87	81	79
Income (Loss) from Continuing Operations before Income Taxes		245	166	201
Income Tax Expense From Continuing Operations		43	37	62
Net Income Attributable to Parent		202	129	139
Other Comprehensive (Loss) Income, net of tax(a)
Comprehensive (Loss) Income Attributable to Parent		$ 202	$ 129	$ 139

[1] Tax impacts are insignificant for all periods presented.