Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Revenues
Regulated electric	$ 6,515	$ 6,216	$ 17,223	$ 16,678
Regulated natural gas	223	230	1,231	1,221
Nonregulated electric and other	202	182	522	507
Total operating revenues	6,940	6,628	18,976	18,406
Operating Expenses
Operation, maintenance and other	1,484	1,584	4,337	4,592
Depreciation and amortization	1,186	1,039	3,364	2,979
Property and other taxes	335	323	1,012	954
Impairment charges	(20)	124	(16)	339
Total operating expenses	5,011	5,059	14,376	14,505
Gains (Losses) on Sales of Other Assets and Other, net		10		(87)
Operating Income	1,929	1,579	4,600	3,814
Other Income and Expenses
Equity in earnings of unconsolidated affiliates	50	37	137	49
Other income and expenses, net	104	131	308	327
Total other income and expenses	154	168	445	376
Interest Expense	572	517	1,657	1,550
Income From Continuing Operations Before Income Taxes	1,511	1,230	3,388	2,640
Income Tax Expense From Continuing Operations	188	168	424	449
Income From Continuing Operations	1,323	1,062	2,964	2,191
Income (Loss) From Discontinued Operations, net of tax		4		(1)
Net Income	1,323	1,066	2,964	2,190
Less: Net Loss Attributable to Noncontrolling Interests	(19)	(16)	(110)	(12)
Less: Preferred Dividends	15		27
Net Income Attributable to Duke Energy Corporation	1,327	1,082	3,047	2,202
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments	(2)	1	1	3
Net unrealized (losses) gains on cash flow hedges	(16)	(3)	(62)	10
Reclassification into earnings from cash flow hedges	1	6	4	5
Unrealized gains (losses) on available-for-sale securities	2		10	(5)
Other Comprehensive (Loss) Income, net of tax	(15)	4	(47)	13
Comprehensive Income	1,308	1,070	2,917	2,203
Less: Comprehensive Loss Attributable to Noncontrolling Interests	(19)	(16)	(110)	(12)
Less: Preferred Dividends	15		27
Comprehensive Income Attributable to Duke Energy Corporation	$ 1,312	$ 1,086	$ 3,000	$ 2,215
Net income attributable to Duke Energy Corporation common stockholders
Basic (in usd per share)	$ 1.82	$ 1.51	$ 4.18	$ 3.12
Diluted (in usd per share)	1.82	1.51	4.18	3.11
Basic (in usd per share)	1.82	1.51	4.18	3.12
Diluted (in usd per share)	$ 1.82	$ 1.51	$ 4.18	$ 3.11
Weighted average shares outstanding
Weighted Average Number of Shares Outstanding, Basic	729	713	728	705
Weighted Average Number of Shares Outstanding, Diluted	729	714	728	706
Duke Energy Carolinas [Member]
Operating Revenues
Total operating revenues	$ 2,162	$ 2,090	$ 5,619	$ 5,525
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	504	490	1,371	1,370
Operation, maintenance and other	443	514	1,324	1,464
Depreciation and amortization	350	305	1,013	866
Property and other taxes	66	67	221	214
Impairment charges	6	1	11	191
Total operating expenses	1,369	1,377	3,940	4,105
Gains (Losses) on Sales of Other Assets and Other, net				(1)
Operating Income	793	713	1,679	1,419
Other Income and Expenses
Total other income and expenses	34	34	106	108
Interest Expense	119	106	346	323
Income From Continuing Operations Before Income Taxes	708	641	1,439	1,204
Income Tax Expense From Continuing Operations	118	145	255	268
Net Income Attributable to Duke Energy Corporation	590	496	1,184	936
Other Comprehensive Income (Loss), net of tax
Reclassification into earnings from cash flow hedges				1
Other Comprehensive (Loss) Income, net of tax				1
Comprehensive Income Attributable to Duke Energy Corporation	590	496	1,184	937
Progress Energy [Member]
Operating Revenues
Total operating revenues	3,242	3,045	8,558	8,119
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	1,187	1,148	3,100	3,019
Operation, maintenance and other	640	680	1,813	1,913
Depreciation and amortization	496	419	1,377	1,183
Property and other taxes	159	145	439	399
Impairment charges	(25)	1	(25)	34
Total operating expenses	2,457	2,393	6,704	6,548
Gains (Losses) on Sales of Other Assets and Other, net	1	11		23
Operating Income	786	663	1,854	1,594
Other Income and Expenses
Total other income and expenses	41	51	106	128
Interest Expense	212	214	650	626
Income From Continuing Operations Before Income Taxes	615	500	1,310	1,096
Income Tax Expense From Continuing Operations	94	94	212	186
Net Income	521	406	1,098	910
Less: Net Loss Attributable to Noncontrolling Interests	0	2	0	6
Net Income Attributable to Duke Energy Corporation	521	404	1,098	904
Other Comprehensive Income (Loss), net of tax
Pension and OPEB adjustments			2	2
Net unrealized (losses) gains on cash flow hedges	1	2	4	5
Unrealized gains (losses) on available-for-sale securities	1		2	(1)
Other Comprehensive (Loss) Income, net of tax	2	2	8	6
Comprehensive Income	523	408	1,106	916
Less: Comprehensive Loss Attributable to Noncontrolling Interests		2		6
Comprehensive Income Attributable to Duke Energy Corporation	523	406	1,106	910
Duke Energy Progress [Member]
Operating Revenues
Total operating revenues	1,688	1,582	4,559	4,333
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	577	535	1,571	1,452
Operation, maintenance and other	378	431	1,070	1,187
Depreciation and amortization	314	253	855	723
Property and other taxes	46	40	131	115
Impairment charges				33
Total operating expenses	1,315	1,259	3,627	3,510
Gains (Losses) on Sales of Other Assets and Other, net		7		9
Operating Income	373	330	932	832
Other Income and Expenses
Total other income and expenses	27	24	75	61
Interest Expense	74	82	232	241
Income From Continuing Operations Before Income Taxes	326	272	775	652
Income Tax Expense From Continuing Operations	48	56	125	120
Net Income Attributable to Duke Energy Corporation	278	216	650	532
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy Corporation			650	532
Duke Energy Florida [Member]
Operating Revenues
Total operating revenues	1,548	1,462	3,987	3,780
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	610	614	1,529	1,567
Operation, maintenance and other	256	245	730	719
Depreciation and amortization	182	166	522	460
Property and other taxes	113	105	309	284
Impairment charges	(25)	1	(25)	1
Total operating expenses	1,136	1,131	3,065	3,031
Gains (Losses) on Sales of Other Assets and Other, net	1
Operating Income	413	331	922	749
Other Income and Expenses
Total other income and expenses	14	28	39	75
Interest Expense	81	73	246	210
Income From Continuing Operations Before Income Taxes	346	286	715	614
Income Tax Expense From Continuing Operations	57	43	129	100
Net Income Attributable to Duke Energy Corporation	289	243	586	514
Other Comprehensive Income (Loss), net of tax
Unrealized gains (losses) on available-for-sale securities	1		2	(1)
Other Comprehensive (Loss) Income, net of tax	1		2	(1)
Comprehensive Income Attributable to Duke Energy Corporation	290	243	588	513
Duke Energy Ohio [Member]
Operating Revenues
Regulated electric	408	373	1,099	1,055
Regulated natural gas	81	84	354	361
Nonregulated electric and other		12		36
Total operating revenues	489	469	1,453	1,452
Operating Expenses
Operation, maintenance and other	123	76	378	337
Depreciation and amortization	69	64	199	196
Property and other taxes	71	73	229	218
Total operating expenses	381	330	1,167	1,151
Gains (Losses) on Sales of Other Assets and Other, net				(106)
Operating Income	108	139	286	195
Other Income and Expenses
Total other income and expenses	4	3	19	17
Interest Expense	27	23	81	68
Income From Continuing Operations Before Income Taxes	85	119	224	144
Income Tax Expense From Continuing Operations	11	19	34	23
Net Income Attributable to Duke Energy Corporation	74	100	190	121
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy Corporation			190	121
Duke Energy Indiana [Member]
Operating Revenues
Total operating revenues	807	819	2,289	2,288
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	234	272	720	730
Operation, maintenance and other	192	198	569	576
Depreciation and amortization	130	130	393	386
Property and other taxes	16	16	55	56
Impairment charges		30		30
Total operating expenses	572	646	1,737	1,778
Operating Income	235	173	552	510
Other Income and Expenses
Total other income and expenses	8	23	35	36
Interest Expense	40	42	111	125
Income From Continuing Operations Before Income Taxes	203	154	476	421
Income Tax Expense From Continuing Operations	47	35	113	104
Net Income Attributable to Duke Energy Corporation	156	119	363	317
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy Corporation			363	317
Piedmont Natural Gas [Member]
Operating Revenues
Total operating revenues	168	172	956	940
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	46	54	384	387
Operation, maintenance and other	78	85	241	252
Depreciation and amortization	43	40	127	118
Property and other taxes	14	12	39	36
Total operating expenses	181	191	791	793
Operating Income	(13)	(19)	165	147
Other Income and Expenses
Equity in earnings of unconsolidated affiliates			6	6
Total other income and expenses	7	6	19	15
Interest Expense	22	19	65	60
Income From Continuing Operations Before Income Taxes	(28)	(32)	119	102
Income Tax Expense From Continuing Operations	(10)	(11)	22	21
Net Income Attributable to Duke Energy Corporation	(18)	(21)	97	81
Other Comprehensive Income (Loss), net of tax
Comprehensive Income Attributable to Duke Energy Corporation			97	81
Electricity, US Regulated [Member] | Duke Energy Ohio [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	114	99	293	284
Electricity, Nonregulated [Member] | Duke Energy Ohio [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		14		43
Electricity [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	1,978	1,931	5,228	5,181
Natural Gas [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	48	58	451	460
Natural Gas [Member] | Duke Energy Ohio [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas	$ 4	$ 4	$ 68	$ 73