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		Preferred stock, Series A Preferred Stock		Preferred stock, Series A Common Stockholders' Equity	[2]	Preferred stock, Series B	Common Stock	Common Stock Common Stockholders' Equity	Common Stock Common Stock	Common Stock Additional Paid-in Capital	Preferred Stock	Preferred Stock Preferred Stock	Preferred Stock Common Stockholders' Equity
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
Net income (loss) (attributable to parent)		1,732																		594		594			577													$ 372	372	297	297		116			116	$ 207	207	115		115
Net (loss) income		1,641																							577		577		577
Net income		1,629			1,720					1,720								(91)
Other comprehensive income (loss)		(32)	[1]		(32)							(43)		8		3									6		6				3		1	2						1		1
Stock issuances																																																				$ 973	[2]	$ 973	[2]	$ 973			$ 89	$ 89		$ 89
Stock issuances, in shares																																																						40,000,000							1,000,000
Common stock dividends		(1,354)			(1,354)					(1,354)
Contribution from noncontrolling interest in subsidiaries	[3]	193																193
Distributions to noncontrolling interest in subsidiaries		(1)																(1)
Contribution from parent																																																	150	150
Other		1	[4]					1	[4]	23	[4]	(6)	[4]	(1)	[4]	(17)	[4]	1	[4]	(1)				(1)	(1)	[5]			7	[5]	(4)	[5]		(3)	[5]	(1)	[5]
Ending 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
Ending Balance, in shares at Jun. 30, 2019							728,000,000
Ending Balance (member's equity) at Jun. 30, 2019																				12,276		12,283		(7)															8,813	6,393	6,394	(1)						4,546
Ending Balance (parent) at Jun. 30, 2019																																											3,561	762	2,776	23			2,356	1,310	1,046
Beginning Balance at Mar. 31, 2019		45,045		974	45,030		$ 1	40,823		3,360		(36)				(92)		15							14,508		14,506	9,143	5,386		(14)		(1)	(8)		2
Beginning Balance, in shares at Mar. 31, 2019							728,000,000
Beginning Balance (member's equity) at Mar. 31, 2019																				11,975		11,982		(7)															8,644	6,192	6,193	(1)						4,449
Beginning Balance (parent) at Mar. 31, 2019																																											3,514	762	2,776	(24)			2,213	1,160	1,053
Net income (loss) (attributable to parent)		832																		301		301			328													169	169	201	201		47			47	97	97	(7)		(7)
Net (loss) income		748																							329		328		328							1
Net income		736			820					820								(84)
Other comprehensive income (loss)		(20)	[1]		(20)							(27)		4		3									3		3				1		1	1
Stock issuances																																																											61	61		61	$ (1)	$ (1)	$ (1)
Common stock dividends		(678)			(678)					(678)
Contribution from noncontrolling interest in subsidiaries	[3]	193																193
Distributions to noncontrolling interest in subsidiaries		(1)																(1)
Contribution from parent																																																	150	150
Other		(3)			1			1										(4)							(1)				1					(1)		(1)
Ending 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
Ending Balance, in shares at Jun. 30, 2019							728,000,000
Ending Balance (member's equity) at Jun. 30, 2019																				12,276		12,283		(7)															8,813	6,393	6,394	(1)						4,546
Ending Balance (parent) at Jun. 30, 2019																																											$ 3,561	762	2,776	23			$ 2,356	1,310	1,046
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, in shares at Dec. 31, 2019																																																				40,000,000						1,000,000
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
Net income (loss) (attributable to parent)		136																		573		573			627													365	365	336	336		$ 131			131	180	180	180		180
Net (loss) income		(2)																							627		627		627
Net income		(56)			82					82								(138)
Other comprehensive income (loss)		(65)	[1]		(53)							(60)		7				(12)							3		3				2			1
Stock issuances																																																											116	116		116
Stock issuances, in shares																																																													2,000,000
Common stock dividends		(1,391)			(1,391)					(1,391)										(300)		(300)																										(100)
Contribution from noncontrolling interest in subsidiaries		163																163
Distributions to noncontrolling interest in subsidiaries		(14)																(14)							(1)											(1)
Other		(93)	[6]		(92)	[6]				(92)	[6]							(1)	[6]	(12)	[7]	(12)	[7]		(1)		(2)		(2)							1			(1)										$ (1)		(1)
Ending 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
Ending Balance, in shares at Jun. 30, 2020																																																				40,000,000						1,000,000
Ending Balance, in shares at Jun. 30, 2020		735,000,000					735,000,000																		100																		90,000,000						100
Ending Balance (member's equity) at Jun. 30, 2020																				13,072		13,079		(7)														9,610	9,610	7,124	7,125	(1)					4,655	4,655
Ending Balance (parent) at Jun. 30, 2020		$ 45,484																							$ 16,218																		$ 3,814	762	2,776	276			$ 2,622	1,310	1,312
Beginning Balance at Mar. 31, 2020		48,083		1,962	46,921		$ 1	40,930		4,221		(116)		4		(81)		1,162							15,877		15,874	9,143	6,747		(9)			(7)		3
Beginning Balance, in shares at Mar. 31, 2020							735,000,000
Beginning Balance (member's equity) at Mar. 31, 2020																				12,837		12,844		(7)															9,450	6,909	6,909							4,674
Beginning Balance (parent) at Mar. 31, 2020																																											3,748	762	2,776	210			2,620	1,310	1,310
Net income (loss) (attributable to parent)		(802)																		234		234			344													161	161	216	216		$ 66			66	81	81	$ 2		2
Net (loss) income		(892)																							344		344		344
Net income		(907)			(817)					(817)								(90)
Other comprehensive income (loss)		12	[1]		10							5		6		(1)		2							1		1				1		(1)	1						(1)		(1)
Stock issuances																																																											$ 66	$ 66		$ 66
Common stock dividends		(696)			(696)					(696)																																						(100)
Contribution from noncontrolling interest in subsidiaries	[3]	60																60
Distributions to noncontrolling interest in subsidiaries		(7)																(7)							(1)											(1)
Other		0						1		(1)										1		1					(1)		(1)							1			(1)
Ending 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
Ending Balance, in shares at Jun. 30, 2020																																																				40,000,000						1,000,000
Ending Balance, in shares at Jun. 30, 2020		735,000,000					735,000,000																		100																		90,000,000						100
Ending Balance (member's equity) at Jun. 30, 2020																				$ 13,072		$ 13,079		$ (7)														$ 9,610	$ 9,610	$ 7,124	$ 7,125	$ (1)					$ 4,655	$ 4,655
Ending Balance (parent) at Jun. 30, 2020		$ 45,484																							$ 16,218																		$ 3,814	$ 762	$ 2,776	$ 276			$ 2,622	$ 1,310	$ 1,312

[1] Net of income tax impacts of approximately $20 million and $10 million for the six months ended June 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] Relates to tax equity financing activity in the Commercial Renewables segment.

[4] 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.

[5] 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.

[6] 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.

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