Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	2 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016		Oct. 31, 2016
Operating Revenues
Regulated electric		$ 22,097	$ 21,177	$ 21,221
Regulated natural gas		1,773	1,734	863
Nonregulated electric and other		651	654	659
Total operating revenues		24,521	23,565	22,743
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		6,831	6,350	6,625
Cost of natural gas		697	632	265
Operation, maintenance and other		6,463	5,944	6,224
Depreciation and amortization		4,074	3,527	3,294
Property and other taxes		1,280	1,233	1,142
Impairment charges		402	282	18
Total operating expenses		19,747	17,968	17,568
(Losses) Gains on Sales of Other Assets and Other, net		(89)	28	27
Operating Income		4,685	5,625	5,202
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates		83	119	(15)
Other income and expenses, net		399	508	463
Total other income and expenses		482	627	448
Interest Expense		2,094	1,986	1,916
Income From Continuing Operations Before Income Taxes		3,073	4,266	3,734
Income Tax Expense From Continuing Operations		448	1,196	1,156
Income From Continuing Operations		2,625	3,070	2,578
Income (Loss) From Discontinued Operations, net of tax		19	(6)	(408)
Net Income		2,644	3,064	2,170
Less: Net (Loss) Income Attributable to Noncontrolling Interests		(22)	5	18
Net Income Attributable to Parent		2,666	3,059	2,152
Other Comprehensive (Loss) Income, net of tax
Pension and OPEB adjustments		(6)	3	(11)
Net unrealized (losses) gains on cash flow hedges		(10)	2	17
Reclassification into earnings from cash flow hedges		6	8	13
Unrealized gains on available for sale securities		(3)	13	2
Other Comprehensive (Loss) Income, net of tax		(13)	26	715	[1]
Comprehensive Income		2,631	3,090	2,885
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests		(22)	5	20
Comprehensive (Loss) Income Attributable to Parent		$ 2,653	$ 3,085	$ 2,865
Income from continuing operations attributable to Duke Energy Corporation common stockholders
Basic (in usd per share)		$ 3.73	$ 4.37	$ 3.71
Diluted (in usd per share)		3.73	4.37	3.71
Income (Loss) from discontinued operations attributable to Duke Energy Corporation common stockholders
Basic (in usd per share)		0.03	(0.01)	(0.60)
Diluted (in usd per share)		0.03	(0.01)	(0.60)
Net income attributable to Duke Energy Corporation common stockholders
Basic (in usd per share)		3.76	4.36	3.11
Diluted (in usd per share)		$ 3.76	$ 4.36	$ 3.11
Weighted average shares outstanding
Basic (in shares)		708	700	691
Diluted (in shares)		708	700	691
Duke Energy Carolinas [Member]
Operating Revenues
Total operating revenues		$ 7,300	$ 7,302	$ 7,322
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,821	1,822	1,797
Operation, maintenance and other		2,130	2,021	2,158
Depreciation and amortization		1,201	1,090	1,075
Property and other taxes		295	281	276
Impairment charges		192		1
Total operating expenses		5,639	5,214	5,307
(Losses) Gains on Sales of Other Assets and Other, net		(1)	1	(5)
Operating Income		1,660	2,089	2,010
Other Income and Expenses
Other income and expenses, net		153	199	214
Total other income and expenses		153	199	214
Interest Expense		439	422	424
Income From Continuing Operations Before Income Taxes		1,374	1,866	1,800
Income Tax Expense From Continuing Operations		303	652	634
Net Income Attributable to Parent		1,071	1,214	1,166
Other Comprehensive (Loss) Income, net of tax
Reclassification into earnings from cash flow hedges		1	2	2
Other Comprehensive (Loss) Income, net of tax		1	2	2
Comprehensive (Loss) Income Attributable to Parent		1,072	1,216	1,168
Progress Energy [Member]
Operating Revenues
Total operating revenues		10,728	9,783	9,853
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		3,976	3,417	3,644
Operation, maintenance and other		2,613	2,301	2,458
Depreciation and amortization		1,619	1,285	1,213
Property and other taxes		529	503	487
Impairment charges		87	156	7
Total operating expenses		8,824	7,662	7,809
(Losses) Gains on Sales of Other Assets and Other, net		24	26	25
Operating Income		1,928	2,147	2,069
Other Income and Expenses
Other income and expenses, net		165	209	186
Total other income and expenses		165	209	186
Interest Expense		842	824	689
Income From Continuing Operations Before Income Taxes		1,251	1,532	1,566
Income Tax Expense From Continuing Operations		218	264	527
Income From Continuing Operations		1,033	1,268	1,039
Income (Loss) From Discontinued Operations, net of tax				2
Net Income		1,033	1,268	1,041
Less: Net (Loss) Income Attributable to Noncontrolling Interests		6	10	10
Net Income Attributable to Parent		1,027	1,258	1,031
Other Comprehensive (Loss) Income, net of tax
Pension and OPEB adjustments		5	4	1
Net unrealized (losses) gains on cash flow hedges		6	5
Reclassification into earnings from cash flow hedges		0	0	8
Unrealized gains on available for sale securities		(1)	4	1
Other Comprehensive (Loss) Income, net of tax		10	13	10
Comprehensive Income		1,043	1,281	1,051
Less: Comprehensive (Loss) Income Attributable to Noncontrolling Interests		6	10	10
Comprehensive (Loss) Income Attributable to Parent		1,037	1,271	1,041
Duke Energy Progress [Member]
Operating Revenues
Total operating revenues		5,699	5,129	5,277
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,892	1,609	1,830
Operation, maintenance and other		1,578	1,439	1,565
Depreciation and amortization		991	725	703
Property and other taxes		155	156	156
Impairment charges		33	19	1
Total operating expenses		4,649	3,948	4,255
(Losses) Gains on Sales of Other Assets and Other, net		9	4	3
Operating Income		1,059	1,185	1,025
Other Income and Expenses
Other income and expenses, net		87	115	132
Total other income and expenses		87	115	132
Interest Expense		319	293	257
Income From Continuing Operations Before Income Taxes		827	1,007	900
Income Tax Expense From Continuing Operations		160	292	301
Net Income Attributable to Parent		667	715	599
Other Comprehensive (Loss) Income, net of tax
Comprehensive (Loss) Income Attributable to Parent		667	715	599
Duke Energy Florida [Member]
Operating Revenues
Total operating revenues		5,021	4,646	4,568
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		2,085	1,808	1,814
Operation, maintenance and other		1,025	853	884
Depreciation and amortization		628	560	509
Property and other taxes		374	347	333
Impairment charges		54	138	6
Total operating expenses		4,166	3,706	3,546
(Losses) Gains on Sales of Other Assets and Other, net		1	1
Operating Income		856	941	1,022
Other Income and Expenses
Other income and expenses, net		86	96	63
Total other income and expenses		86	96	63
Interest Expense		287	279	212
Income From Continuing Operations Before Income Taxes		655	758	873
Income Tax Expense From Continuing Operations		101	46	322
Net Income Attributable to Parent		554	712	551
Other Comprehensive (Loss) Income, net of tax
Unrealized gains on available for sale securities		(1)	3	1
Other Comprehensive (Loss) Income, net of tax		(1)	3	1
Comprehensive (Loss) Income Attributable to Parent		553	715	552
Duke Energy Ohio [Member]
Operating Revenues
Regulated electric		1,450	1,373	1,410
Regulated natural gas		506	508	503
Nonregulated electric and other		1	42	31
Total operating revenues		1,957	1,923	1,944
Operating Expenses
Cost of natural gas		113	107	103
Operation, maintenance and other		480	530	514
Depreciation and amortization		268	261	233
Property and other taxes		290	278	258
Impairment charges			1
Total operating expenses		1,563	1,604	1,601
(Losses) Gains on Sales of Other Assets and Other, net		(106)	1	2
Operating Income		288	320	345
Other Income and Expenses
Other income and expenses, net		23	23	11
Total other income and expenses		23	23	11
Interest Expense		92	91	86
Income From Continuing Operations Before Income Taxes		219	252	270
Income Tax Expense From Continuing Operations		43	59	78
Income From Continuing Operations		176	193	192
Income (Loss) From Discontinued Operations, net of tax			(1)	36
Net Income Attributable to Parent		176	192	228
Other Comprehensive (Loss) Income, net of tax
Comprehensive (Loss) Income Attributable to Parent		176	192	228
Duke Energy Indiana [Member]
Operating Revenues
Total operating revenues		3,059	3,047	2,958
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		1,000	966	909
Operation, maintenance and other		788	743	727
Depreciation and amortization		520	458	496
Property and other taxes		78	76	58
Impairment charges		30	18	8
Total operating expenses		2,416	2,261	2,198
(Losses) Gains on Sales of Other Assets and Other, net				1
Operating Income		643	786	761
Other Income and Expenses
Other income and expenses, net		45	47	26
Total other income and expenses		45	47	26
Interest Expense		167	178	181
Income From Continuing Operations Before Income Taxes		521	655	606
Income Tax Expense From Continuing Operations		128	301	225
Net Income Attributable to Parent		393	354	381
Other Comprehensive (Loss) Income, net of tax
Reclassification into earnings from cash flow hedges				(1)
Other Comprehensive (Loss) Income, net of tax				(1)
Comprehensive (Loss) Income Attributable to Parent		393	354	380
Piedmont Natural Gas [Member]
Operating Revenues
Regulated natural gas	$ 320	1,365	1,319			$ 1,139
Nonregulated electric and other	2	10	9			10
Total operating revenues	322	1,375	1,328			1,149
Operating Expenses
Cost of natural gas	144	584	524			391
Operation, maintenance and other	50	357	304			353
Depreciation and amortization	23	159	148			137
Property and other taxes	7	49	48			43
Impairment charges			7
Total operating expenses	224	1,149	1,031			924
Operating Income	98	226	297			225
Other Income and Expenses
Equity in earnings (losses) of unconsolidated affiliates	2	7	(6)			29
Gain on sale of unconsolidated affiliates						133
Other income and expenses, net	(2)	14	(11)			(1)
Total other income and expenses		21	(17)			161
Interest Expense	12	81	79			69
Income From Continuing Operations Before Income Taxes	86	166	201			317
Income Tax Expense From Continuing Operations	32	37	62			124
Net Income Attributable to Parent	54	129	139			193
Other Comprehensive (Loss) Income, net of tax
Net unrealized (losses) gains on cash flow hedges						(3)
Reclassification into earnings from cash flow hedges						4
Other Comprehensive (Loss) Income, net of tax						1
Comprehensive (Loss) Income Attributable to Parent	$ 54	129	139			$ 194
Electricity, US Regulated [Member] | Duke Energy Ohio [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas		$ 412	369	442
Electricity, Nonregulated [Member] | Duke Energy Ohio [Member]
Operating Expenses
Fuel used in electric generation and purchased power/Cost of natural gas			$ 58	$ 51

[1] Foreign Currency Translation Adjustments amount includes $620 million of cumulative adjustment realized as a result of the sale of the Latin American generation business. See Note 2 to the Consolidated Financial Statements.