Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions		Total		Preferred Stock	Common Stockholders' Equity		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	Piedmont Common Stock	Piedmont Retained Earnings	Common Stock	Common Stock Common Stockholders' Equity	Common Stock Common Stock	Common Stock Additional Paid-in Capital
Beginning Balance at Dec. 31, 2019		$ 47,951		$ 1,962	$ 46,822		$ 40,881		$ 4,108		$ (51)	$ 3	$ (82)	$ 1,129						$ 15,593	$ 15,590	$ 9,143	$ 6,465	$ (10)	$ (1)	$ (7)	$ 3																	$ 1
Beginning Balance, in shares at Dec. 31, 2019																																												733,000,000
Beginning Balance (member's equity) at Dec. 31, 2019															$ 12,811		$ 12,818		$ (7)										$ 9,246	$ 6,788	$ 6,789	$ (1)						$ 4,575
Beginning Balance (parent) at Dec. 31, 2019																																	$ 3,683	$ 762	$ 2,776	$ 145			$ 2,443	$ 1,310	$ 1,133
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,139			1,347				1,347					(208)
Net income		1,440													1,128		1,128			1,232								$ 711	711	623	623		201			201	$ 299	299	155		155
Net income		1,232																		1,233	1,232		1,232				1
Other comprehensive (loss) income		(145)	[1]		(133)						(139)	5	1	(12)						5	5			3	1	1				1		1
Common stock issuances, including dividend reinvestment and employee benefits																																										$ 181	$ 181		$ 181
Common stock issuances, including dividend reinvestment and employee benefits (in shares)																																												3,000,000
Common stock dividends		(2,103)			(2,103)				(2,103)						(600)		(600)			(400)	(400)		(400)						(400)									(200)
Contributions from noncontrolling interests, net of transaction costs	[2]	385			(17)		(17)							402
Distributions to noncontrolling interest in subsidiaries		(22)												(22)						(1)							(1)
Other		(91)	[3]		(91)	[3]	1	[3]	(92)	[3]					(13)	[4]	(13)	[4]		(1)	(1)		(1)						(1)	(1)	(1)								(1)		(1)
Ending Balance at Sep. 30, 2020		47,295		1,962	46,006		41,046		3,260		(190)	8	(81)	1,289						16,429	16,426	9,143	7,296	(7)		(6)	3																	$ 1
Ending Balance (member's equity) at Sep. 30, 2020															13,326		13,333		(7)										9,556	7,411	7,411							4,674
Ending Balance, in shares at Sep. 30, 2020																																												736,000,000
Ending Balance (parent) at Sep. 30, 2020																																	3,884	762	2,776	346			2,597	1,310	1,287
Beginning Balance at Jun. 30, 2020		46,611		1,962	45,484		40,997		2,707		(111)	10	(82)	1,127						16,221	16,218	9,143	7,090	(8)	(1)	(6)	3																	$ 1
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 (loss)		1,195			1,265				1,265					(70)
Net income		1,304													555		555			605								346	346	287	287		70			70	119	119	(25)		(25)
Net income		1,234																		606	605		605				1
Other comprehensive (loss) income		(80)	[1]		(80)						(79)	(2)	1							2	2			1	1					1		1
Common stock issuances, including dividend reinvestment and employee benefits																																										65	65		65
Common stock issuances, including dividend reinvestment and employee benefits (in shares)																																												1,000,000
Common stock dividends		(712)			(712)				(712)						(300)		(300)			(400)	(400)		(400)						(400)									(100)
Contributions from noncontrolling interests, net of transaction costs	[2]	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		41,046		3,260		(190)	8	(81)	1,289						16,429	16,426	9,143	7,296	(7)		(6)	3																	$ 1
Ending Balance (member's equity) at Sep. 30, 2020															13,326		13,333		(7)										9,556	7,411	7,411							4,674
Ending Balance, in shares at Sep. 30, 2020																																												736,000,000
Ending Balance (parent) at Sep. 30, 2020																																	$ 3,884	762	2,776	346			$ 2,597	1,310	1,287
Beginning Balance at Dec. 31, 2020		$ 49,184		1,962	47,964		43,767		2,471		(167)	6	(76)	1,220						$ 16,241	16,237	9,143	7,109	(5)	(2)	(8)	4																	$ 1
Beginning Balance, in shares at Dec. 31, 2020		769,000,000																		100													90,000,000						100,000,000					769,000,000
Beginning Balance (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
Beginning Balance (parent) at Dec. 31, 2020		$ 47,964																		$ 16,237													$ 3,935	762	2,776	397			$ 2,715	1,310	1,405
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		2,823			3,070				3,070					(247)
Net income		3,162													1,070		1,070			1,333								800	800	631	631		$ 188			188	396	396	175		175
Net income		2,915																		1,334	1,333		1,333				1
Other comprehensive (loss) income		(53)	[1]		(60)						(57)	(6)	3	7						2	2			2
Common stock issuances, including dividend reinvestment and employee benefits																																										43	43		43
Common stock dividends		(2,248)			(2,248)				(2,248)						(600)		(600)			(700)	(700)		(700)						(700)									(125)
Sale of noncontrolling interest	[5]	999			545		545							454
Contributions from noncontrolling interests, net of transaction costs	[2]	525			(6)		(6)							531
Distributions to noncontrolling interest in subsidiaries		(34)												(34)						(1)							(1)
Other		1			(1)		(1)							2						6	7	6	1				(1)			(1)	(1)							1	(1)		(1)
Contribution from parent																																							$ 325	325
Ending Balance at Sep. 30, 2021		$ 51,240		1,962	49,307		44,348		3,293		(224)		(73)	1,933						$ 16,882	16,879	9,149	7,743	(3)	(2)	(8)	3																	$ 1
Ending Balance (member's equity) at Sep. 30, 2021															13,624		13,631		(7)									9,360	9,360	8,188	8,190	(2)					5,055	5,055
Ending Balance, in shares at Sep. 30, 2021		769,000,000																		100													90,000,000						100,000,000					769,000,000
Ending Balance (parent) at Sep. 30, 2021		$ 49,307																		$ 16,879													$ 4,123	762	2,776	585			$ 3,214	1,635	1,579
Beginning Balance at Jun. 30, 2021		49,545		1,962	48,132		43,788		2,687		(234)	2	(74)	1,413						16,942	16,939	9,143	7,809	(4)	(2)	(7)	3																	$ 1
Beginning Balance, in shares at Jun. 30, 2021																																												769,000,000
Beginning Balance (member's equity) at Jun. 30, 2021															13,392		13,399		(7)										9,685	7,891	7,893	(2)						4,999
Beginning Balance (parent) at Jun. 30, 2021																																	4,065	762	2,776	527			3,239	1,635	1,604
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,237			1,366				1,366					(129)
Net income		1,405													533		533			632								375	375	297	297		$ 58			58	181	181	(24)		(24)
Net income		1,276																		633	632		632				1
Other comprehensive (loss) income		10	[1]		9						10	$ (2)	1	1										1		(1)
Common stock issuances, including dividend reinvestment and employee benefits																																										$ 20	$ 20		$ 20
Common stock dividends		(760)			(760)				(760)						(300)		(300)			(700)	(700)		(700)						(700)									(125)
Sale of noncontrolling interest	[5]	999			545		545							454
Contributions from noncontrolling interests, net of transaction costs	[2]	210			(3)		(3)							213
Distributions to noncontrolling interest in subsidiaries		(22)												(22)
Other		1			(2)		(2)							3	(1)		(1)			7	8	6	2				(1)												$ (1)		(1)
Ending Balance at Sep. 30, 2021		$ 51,240		$ 1,962	$ 49,307		$ 44,348		$ 3,293		$ (224)		$ (73)	$ 1,933						$ 16,882	$ 16,879	$ 9,149	$ 7,743	$ (3)	$ (2)	$ (8)	$ 3																	$ 1
Ending Balance (member's equity) at Sep. 30, 2021															$ 13,624		$ 13,631		$ (7)									$ 9,360	$ 9,360	$ 8,188	$ 8,190	$ (2)					$ 5,055	$ 5,055
Ending Balance, in shares at Sep. 30, 2021		769,000,000																		100													90,000,000						100,000,000					769,000,000
Ending Balance (parent) at Sep. 30, 2021		$ 49,307																		$ 16,879													$ 4,123	$ 762	$ 2,776	$ 585			$ 3,214	$ 1,635	$ 1,579

[1] Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020, and $16 million and $43 million for the nine months ended September 30, 2021, and 2020, respectively. All other periods presented include immaterial income tax impacts.

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

[3] 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.

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

[5] Relates to the sale of a noncontrolling interest in Duke Energy Indiana. See Note 2 for additional discussion.