Consolidated Statements of Equity - USD ($) $ in Millions		Total		Preferred Stock	Common Stock	Additional Paid In Capital		Retained Earnings		Net Gains (Losses) on Cash Flow Hedges		Net Unrealized Gains (Losses) on Available-for-Sale Securities		Pension and OPEB Adjustments		Common Stockholders' Equity		Noncontrolling Interests		Duke Energy Carolinas		Duke Energy Carolinas Members Equity		Duke Energy Carolinas Net Gains (Losses) on Cash Flow Hedges	Progress Energy		Progress Energy Additional Paid In Capital	Progress Energy Retained Earnings		Progress Energy Net Gains (Losses) on Cash Flow Hedges		Progress Energy Net Unrealized Gains (Losses) on Available-for-Sale Securities		Progress Energy Pension and OPEB Adjustments		Progress Energy Common Stockholders' Equity		Progress Energy Noncontrolling Interests		Duke Energy Progress	Duke Energy Progress Members Equity	Duke Energy Florida		Duke Energy Florida Members Equity		Duke Energy Florida Net Unrealized Gains (Losses) on Available-for-Sale Securities		Duke Energy Ohio	Duke Energy Ohio Common Stock	Duke Energy Ohio Additional Paid In Capital	Duke Energy Ohio Retained Earnings	Duke Energy Indiana	Duke Energy Indiana Members Equity	Piedmont	Piedmont Common Stock	Piedmont Retained Earnings	Common Stock	Common Stock Common Stock	Common Stock Additional Paid In Capital	Common Stock Common Stockholders' Equity	Series A Preferred Stock	[5]	Series A Preferred Stock Preferred Stock	[5]	Series A Preferred Stock Common Stockholders' Equity	[5]	Series B Preferred Stock	[5]	Series B Preferred Stock Preferred Stock	[5]	Series B Preferred Stock Common Stockholders' Equity	[5]
Beginning Balance (parent) at Dec. 31, 2017		$ 41,737			$ 1	$ 38,792		$ 3,013		$ (10)		$ 12		$ (69)		$ 41,739		$ (2)							$ 13,465		$ 9,143	$ 4,350		$ (18)		$ 5		$ (12)		$ 13,468		$ (3)
Beginning Members' Equity at Dec. 31, 2017																				$ 11,361		$ 11,368		$ (7)																	$ 7,949	$ 5,618		$ 5,614		$ 4							$ 4,121
Beginning Balance (Attributable to Parent) at Dec. 31, 2017																																																$ 3,163	$ 762	$ 2,670	$ (269)			$ 1,662	$ 860	$ 802
Balance (in shares) at Dec. 31, 2017																																																										700,000,000
Net income		2,644						2,666								2,666		(22)
Net (loss) income attributable to Duke Energy		2,666																		1,071		1,071			1,027															$ 667	667	554		554				176			176	$ 393	393	129		129
Net income		2,644																							1,033			1,027								1,027		6
Contribution from parent																																																106		106				300	300
Other comprehensive income (loss), net of tax		(13)	[1]							(4)		(3)		(6)		(13)				1				1	10					6		(1)		5		10						(1)				(1)
Stock issuances, shares																																																										27,000,000
Stock issuances																																																									$ 2,003		$ 2,003	$ 2,003
Distributions/Dividends to parent		(2,578)						(2,578)								(2,578)				(750)		(750)			(250)			(250)								(250)					(175)	(75)		(75)									(175)
Distributions to noncontrolling interest in subsidiaries		(1)																(1)							(1)													(1)
Other		42	[2]					12	[2]			(12)	[2]					42	[2]						0	[3]		4	[3]			(5)	[3]			(1)	[3]	1	[3]			(1)	[4]	4	[4]	(5)	[4]
Balance (in shares) at Dec. 31, 2018																																																										727,000,000
Ending Balance (parent) at Dec. 31, 2018		43,834			1	40,795		3,113		(14)		(3)		(75)		43,817		17							14,257		9,143	5,131		(12)		(1)		(7)		14,254		3
Ending member's equity at Dec. 31, 2018																				11,683		11,689		(6)																	8,441	6,095		6,097		(2)							4,339
Ending Balance (Attributable to Parent) at Dec. 31, 2018																																																3,445	762	2,776	(93)			2,091	1,160	931
Net income		3,530						3,707								3,707		(177)
Net (loss) income attributable to Duke Energy		3,748																		1,403		1,403			1,327															805	805	692		692				$ 238			238	436	436	202		202
Net income		3,571																							1,327			1,327								1,327
Contribution from parent																																																						$ 150	150
Other comprehensive income (loss), net of tax		(24)	[1]							(41)		8		9		(24)									8					5		1		2		8						1				1
Stock issuances, shares																																																										6,000,000
Stock issuances																																																									552		552	552	$ 973		$ 973		$ 973		$ 989		$ 989		$ 989
Distributions/Dividends to parent		(2,735)						(2,735)								(2,735)				(275)		(275)																															(200)
Sale of noncontrolling interest	[6]	407				(466)				10						(456)		863
Contribution from noncontrolling interest, net of transaction costs(f)	[7]	428																428
Distributions to noncontrolling interest in subsidiaries		(4)																(4)
Other		$ 1	[8]					23	[8]	(6)	[8]	(2)	[8]	(16)	[8]	(1)	[8]	2	[8]	0		1		(1)	$ 1	[9]		7	[9]	(3)	[9]	(1)	[9]	(2)	[9]	1	[9]
Balance (in shares) at Dec. 31, 2019		733,000,000																							100																							90,000,000						100				733,000,000
Ending Balance (parent) at Dec. 31, 2019		$ 47,951		$ 1,962	1	40,881		4,108		(51)		3		(82)		46,822		1,129							$ 15,593		9,143	6,465		(10)		(1)		(7)		15,590		3
Ending member's equity at Dec. 31, 2019																				12,811		12,818		(7)																9,246	9,246	6,788		6,789		(1)						4,575	4,575
Ending Balance (Attributable to Parent) at Dec. 31, 2019		46,822																							15,590																							$ 3,683	762	2,776	145			$ 2,443	1,310	1,133
Net income		975						1,270								1,270		(295)
Net (loss) income attributable to Duke Energy		1,377																		956		956			1,045															415	415	771		771				$ 252			252	408	408	273		273
Net income		1,082																							1,046			1,045								1,045		1
Other comprehensive income (loss), net of tax		(118)	[1]							(116)		3		6		(107)		(11)							3					5		(1)		(1)		3						(1)				(1)
Stock issuances, shares																																																										36,000,000
Stock issuances																																																									$ 2,902		$ 2,902	$ 2,902
Distributions/Dividends to parent		(2,815)						(2,815)								(2,815)				(600)		(600)			(400)			(400)								(400)					(400)												(200)
Contribution from noncontrolling interest, net of transaction costs(f)	[7]	409				(17)										(17)		426
Distributions to noncontrolling interest in subsidiaries		(30)																(30)
Other		$ (90)	[10]			1	[10]	(92)	[10]							(91)	[10]	1	[10]	(13)	[11]	(13)	[11]		$ (1)			(1)								(1)					(1)													$ (1)		(1)
Balance (in shares) at Dec. 31, 2020		769,000,000																							100																							90,000,000						100				769,000,000
Ending Balance (parent) at Dec. 31, 2020		$ 49,184		$ 1,962	$ 1	$ 43,767		$ 2,471		$ (167)		$ 6		$ (76)		$ 47,964		$ 1,220							$ 16,241		$ 9,143	$ 7,109		$ (5)		$ (2)		$ (8)		$ 16,237		$ 4
Ending member's equity at Dec. 31, 2020																				$ 13,154		$ 13,161		$ (7)																$ 9,260	$ 9,260	$ 7,558		$ 7,560		$ (2)						$ 4,783	$ 4,783
Ending Balance (Attributable to Parent) at Dec. 31, 2020		$ 47,964																							$ 16,237																							$ 3,935	$ 762	$ 2,776	$ 397			$ 2,715	$ 1,310	$ 1,405

[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.

[2] Amounts in Retained Earnings and AOCI represent a cumulative-effect adjustment due to implementation of a new accounting standard related to Financial Instruments Classification and Measurement. See Note 1 for more information. Amount in Noncontrolling Interests primarily relates to tax equity financing activity in the Commercial Renewables segment.

[3] Amounts in Retained Earnings and AOCI represent a cumulative-effect adjustment due to implementation of a new accounting standard related to Financial Instruments Classification and Measurement. See Note 1 for more information.

[4] Amounts represent a cumulative-effect adjustment due to implementation of a new accounting standard related to Financial Instruments Classification and Measurement. See Note 1 for more information.

[5] Duke Energy issued 40 million depositary shares of preferred stock, Series A, in the first quarter of 2019 and 1 million shares of preferred stock, Series B, in the third quarter of 2019.

[6] See Note 1 for additional discussion of the transaction.

[7] Relates to tax equity financing activity in the Commercial Renewables segment.

[8] Amounts in Retained Earnings and AOCI primarily represent impacts to accumulated other comprehensive income due to implementation of a new accounting standard related to Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.

[9] Amounts in Retained Earnings and AOCI primarily represent impacts to accumulated other comprehensive income due to implementation of a new accounting standard related to Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.

[10] Amounts in Retained earnings primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.

[11] Amounts primarily represent impacts due to implementation of a new accounting standard related to Credit Losses. See Note 1 for additional discussion.