Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions		Total		Preferred Stock	Common Stockholders' Equity		Common Stock	Additional Paid-in Capital	Retained Earnings		Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges		Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities		Accumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments		Noncontrolling Interests	Duke Energy Carolinas		Duke Energy Carolinas Member's Equity		Duke Energy Carolinas Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges	Progress Energy	Progress Energy Common Stockholders' Equity	Progress Energy Additional Paid-in Capital	Progress Energy Retained Earnings		Progress Energy Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges		Progress Energy Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities	Progress Energy Accumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments		Progress Energy Noncontrolling Interests	Duke Energy Progress	Duke Energy Progress Member's Equity	Duke Energy Florida	Duke Energy Florida Member's Equity	Duke Energy Florida Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains 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 Member's Equity	Piedmont Natural Gas	Piedmont Natural Gas Common Stock	Piedmont Natural Gas Retained Earnings	Preferred stock, Series A	[2]	Preferred stock, Series A Preferred Stock		Preferred stock, Series A Common Stockholders' Equity	[2]	Preferred stock, Series B	[3]	Preferred stock, Series B Preferred Stock		Preferred stock, Series B Common Stockholders' Equity	[3]	Common Stock	Common Stock Common Stockholders' Equity	Common Stock Common Stock	Common Stock Additional Paid-in Capital
Beginning Balance at Dec. 31, 2018		$ 43,834			$ 43,817		$ 1	$ 40,795	$ 3,113		$ (14)		$ (3)		$ (75)		$ 17						$ 14,257	$ 14,254	$ 9,143	$ 5,131		$ (12)		$ (1)	$ (7)		$ 3
Beginning Balance, in shares at Dec. 31, 2018							727,000,000
Beginning Balance (member's equity) at Dec. 31, 2018																		$ 11,683		$ 11,689		$ (6)													$ 8,441	$ 6,095	$ 6,097	$ (2)						$ 4,339
Beginning Balance (parent) at Dec. 31, 2018																																							$ 3,445	$ 762	$ 2,776	$ (93)			$ 2,091	$ 1,160	$ 931
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		2,937			3,047				3,047								(110)
Net income (loss) (attributable to parent)		3,074																1,184		1,184			1,098											$ 650	650	586	586		190			190	$ 363	363	97		97
Net (loss) income		2,964																					1,098	1,098		1,098
Other comprehensive income (loss)		(47)	[1]		(47)						(58)		10		1								8	8				4		2	2					2		2
Stock issuances																																																$ 973		$ 973	[2]	$ 973		$ 990		$ 990	[3]	$ 990		$ 158	$ 158		$ 158
Stock issuances, in shares																																																		40,000,000												2,000,000
Common stock dividends		(2,044)			(2,044)				(2,044)									(275)		(275)																								(200)
Sale of noncontrolling interest	[4]	408			(455)			(465)			10						863
Contribution from noncontrolling interest in subsidiaries	[5]	200															200
Distributions to noncontrolling interest in subsidiaries		(1)															(1)
Contribution from parent																																													150	150
Other		(1)	[6]		(1)	[6]			23	[6]	(6)	[6]	(1)	[6]	(17)	[6]		(1)				(1)				7	[7]	(4)	[7]	(1)	(2)	[7]
Ending Balance at Sep. 30, 2019		47,407		$ 1,963	46,438		$ 1	40,488	4,139		(68)		6		(91)		969						15,363	15,360	9,143	6,236		(12)			(7)		3
Ending Balance (member's equity) at Sep. 30, 2019																		12,591		12,598		(7)													9,091	6,683	6,683							4,502
Ending Balance, in shares at Sep. 30, 2019							729,000,000
Ending Balance (parent) at Sep. 30, 2019																																							3,635	762	2,776	97			2,338	1,310	1,028
Beginning Balance at Jun. 30, 2019		45,332		973	45,213		$ 1	40,885	3,502		(63)		4		(89)		119						14,839	14,837	9,143	5,715		(13)			(8)		2
Beginning Balance, in shares at Jun. 30, 2019							728,000,000
Beginning Balance (member's equity) at Jun. 30, 2019																		12,276		12,283		(7)													8,813	6,393	6,394	(1)						4,546
Beginning Balance (parent) at Jun. 30, 2019																																							3,561	762	2,776	23			2,356	1,310	1,046
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,308			1,327				1,327								(19)
Net income (loss) (attributable to parent)		1,342																590		590			521											278	278	289	289		74			74	156	156	(18)		(18)
Net (loss) income		1,323																					521	521		521
Other comprehensive income (loss)		(15)	[1]		(15)						(15)		2		(2)								2	2				1		1						1		1
Stock issuances																																																						$ 990		$ 990	[3]	$ 990		69	69		69
Stock issuances, in shares																																																								1,000,000						1,000,000
Common stock dividends		(690)			(690)				(690)									(275)		(275)																								(200)
Sale of noncontrolling interest	[4]	408			(455)			(465)			10						863
Contribution from noncontrolling interest in subsidiaries		7															7
Other		(2)			(1)			(1)									(1)						1							(1)	1		1
Ending Balance at Sep. 30, 2019		47,407		1,963	46,438		$ 1	40,488	4,139		(68)		6		(91)		969						15,363	15,360	9,143	6,236		(12)			(7)		3
Ending Balance (member's equity) at Sep. 30, 2019																		12,591		12,598		(7)													9,091	6,683	6,683							4,502
Ending Balance, in shares at Sep. 30, 2019							729,000,000
Ending Balance (parent) at Sep. 30, 2019																																							$ 3,635	762	2,776	97			$ 2,338	1,310	1,028
Beginning Balance at Dec. 31, 2019		$ 47,951		1,962	46,822		$ 1	40,881	4,108		(51)		3		(82)		1,129						$ 15,593	15,590	9,143	6,465		(10)		(1)	(7)		3
Beginning Balance, in shares at Dec. 31, 2019		733,000,000					733,000,000																100																90,000,000						100
Beginning Balance (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
Beginning Balance (parent) at Dec. 31, 2019		$ 46,822																					$ 15,590																$ 3,683	762	2,776	145			$ 2,443	1,310	1,133
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,139			1,347				1,347								(208)
Net income (loss) (attributable to parent)		1,440																1,128		1,128			1,232											711	711	623	623		$ 201			201	299	299	155		155
Net (loss) income		1,232																					1,233	1,232		1,232							1
Other comprehensive income (loss)		(145)	[1]		(133)						(139)		5		1		(12)						5	5				3		1	1					1		1
Stock issuances																																																												181	181		181
Stock issuances, in shares																																																														3,000,000
Common stock dividends		(2,103)			(2,103)				(2,103)									(600)		(600)			(400)	(400)		(400)									(400)									(200)
Contribution from noncontrolling interest in subsidiaries	[5]	385			(17)			(17)									402
Distributions to noncontrolling interest in subsidiaries		(22)															(22)						(1)										(1)
Other		(91)	[8]		(91)	[8]		1	(92)	[8]								(13)	[9]	(13)	[9]		(1)	(1)		(1)									(1)	(1)	(1)								$ (1)		(1)
Ending Balance at Sep. 30, 2020		$ 47,295		1,962	46,006		$ 1	41,046	3,260		(190)		8		(81)		1,289						$ 16,429	16,426	9,143	7,296		(7)			(6)		3
Ending Balance (member's equity) at Sep. 30, 2020																		13,326		13,333		(7)												9,556	9,556	7,411	7,411						4,674	4,674
Ending Balance, in shares at Sep. 30, 2020		736,000,000					736,000,000																100																90,000,000						100
Ending Balance (parent) at Sep. 30, 2020		$ 46,006																					$ 16,426																$ 3,884	762	2,776	346			$ 2,597	1,310	1,287
Beginning Balance at Jun. 30, 2020		46,611		1,962	45,484		$ 1	40,997	2,707		(111)		10		(82)		1,127						16,221	16,218	9,143	7,090		(8)		(1)	(6)		3
Beginning Balance, in shares at Jun. 30, 2020							735,000,000
Beginning Balance (member's equity) at Jun. 30, 2020																		13,072		13,079		(7)													9,610	7,124	7,125	(1)						4,655
Beginning Balance (parent) at Jun. 30, 2020																																							3,814	762	2,776	276			2,622	1,310	1,312
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		1,195			1,265				1,265								(70)
Net income (loss) (attributable to parent)		1,304																555		555			605											346	346	287	287		$ 70			70	119	119	$ (25)		(25)
Net (loss) income		1,234																					606	605		605							1
Other comprehensive income (loss)		(80)	[1]		(80)						(79)		(2)		1								2	2				1		$ 1						1		$ 1
Stock issuances																																																												$ 65	$ 65		$ 65
Stock issuances, in shares																																																														1,000,000
Common stock dividends		(712)			(712)				(712)									(300)		(300)			(400)	(400)		(400)									(400)									(100)
Contribution from noncontrolling interest in subsidiaries	[5]	222			(17)			(17)									239
Distributions to noncontrolling interest in subsidiaries		(8)															(8)
Other		2			1			1									1	(1)		(1)				1		1							(1)			(1)	(1)
Ending Balance at Sep. 30, 2020		$ 47,295		$ 1,962	$ 46,006		$ 1	$ 41,046	$ 3,260		$ (190)		$ 8		$ (81)		$ 1,289						$ 16,429	$ 16,426	$ 9,143	$ 7,296		$ (7)			$ (6)		$ 3
Ending Balance (member's equity) at Sep. 30, 2020																		$ 13,326		$ 13,333		$ (7)												$ 9,556	$ 9,556	$ 7,411	$ 7,411						$ 4,674	$ 4,674
Ending Balance, in shares at Sep. 30, 2020		736,000,000					736,000,000																100																90,000,000						100
Ending Balance (parent) at Sep. 30, 2020		$ 46,006																					$ 16,426																$ 3,884	$ 762	$ 2,776	$ 346			$ 2,597	$ 1,310	$ 1,287

[1] Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020, and $43 million and $14 million for the nine months ended September 30, 2020, and 2019, respectively. All other periods presented include immaterial income tax impacts.

[2] Duke Energy issued 40 million depositary shares of preferred stock, Series A.

[3] Duke Energy issued 1 million shares of preferred stock, series B, in the third quarter of 2019.

[4] See Note 2 for additional discussion of the transaction.

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

[6] Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income 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.

[7] Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income 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.

[8] 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.

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