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)		(56)			82			82					(138)
Net income		136													573		573											$ 365	365	336	336		131			131	$ 180	180	180		180
Net income (loss)		(2)																		627	627		627
Other comprehensive (loss) income		(65)	[1]		(53)					(60)	7		(12)							3	3			2		1
Common stock issuances, including dividend reinvestment and employee benefits																																										$ 116	$ 116		$ 116
Common stock issuances, including dividend reinvestment and employee benefits (in shares)																																												2,000,000
Common stock dividends		(1,391)			(1,391)			(1,391)							(300)		(300)																					(100)
Contributions from noncontrolling interests, net of transaction costs	[2]	163											163
Distributions to noncontrolling interest in subsidiaries		(14)											(14)							(1)							(1)
Other		(93)	[3]		(92)	[3]		(92)	[3]				(1)	[3]	(12)	[4]	(12)	[4]		(1)	(2)		(2)				1		(1)										(1)		(1)
Ending 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
Ending Balance (member's equity) at Jun. 30, 2020															13,072		13,079		(7)										9,610	7,124	7,125	(1)						4,655
Ending Balance, in shares at Jun. 30, 2020																																												735,000,000
Ending Balance (parent) at Jun. 30, 2020																																	3,814	762	2,776	276			2,622	1,310	1,312
Beginning Balance at Mar. 31, 2020		48,083		1,962	46,921		40,930	4,221		(116)	4	(81)	1,162							15,877	15,874	9,143	6,747	(9)		(7)	3																	$ 1
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(907)			(817)			(817)					(90)
Net income		(802)													234		234											161	161	216	216		66			66	81	81	2		2
Net income (loss)		(892)																		344	344		344
Other comprehensive (loss) income		12	[1]		10					5	6	(1)	2							1	1			1	(1)	1				(1)		(1)
Common stock issuances, including dividend reinvestment and employee benefits																																										66	66		66
Common stock dividends		(696)			(696)			(696)																														(100)
Contributions from noncontrolling interests, net of transaction costs	[2]	60											60
Distributions to noncontrolling interest in subsidiaries		(7)											(7)							(1)							(1)
Other							1	(1)							1		1				(1)		(1)				1		(1)
Ending 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
Ending Balance (member's equity) at Jun. 30, 2020															13,072		13,079		(7)										9,610	7,124	7,125	(1)						4,655
Ending Balance, in shares at Jun. 30, 2020																																												735,000,000
Ending Balance (parent) at Jun. 30, 2020																																	$ 3,814	762	2,776	276			$ 2,622	1,310	1,312
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)		1,586			1,704			1,704					(118)
Net income		1,757													537		537											425	425	334	334		$ 130			130	215	215	199		199
Net income (loss)		1,639																		701	701		701
Other comprehensive (loss) income		(63)	[1]		(69)					(67)	(4)	2	6							2	2			1		1
Common stock issuances, including dividend reinvestment and employee benefits																																										23	23		23
Common stock dividends		(1,488)			(1,488)			(1,488)							(300)		(300)
Contributions from noncontrolling interests, net of transaction costs	[2]	315			(3)		(3)						318
Distributions to noncontrolling interest in subsidiaries		(12)											(12)							(1)							(1)
Other					1		1						(1)		1		1			(1)	(1)		(1)							(1)	(1)							1
Contribution from parent																																							$ 325	325
Ending 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
Ending Balance (member's equity) at Jun. 30, 2021															13,392		13,399		(7)									9,685	9,685	7,891	7,893	(2)					4,999	4,999
Ending Balance, in shares at Jun. 30, 2021		769,000,000																		100													90,000,000						100,000,000					769,000,000
Ending Balance (parent) at Jun. 30, 2021		$ 48,132																		$ 16,939													$ 4,065	762	2,776	527			$ 3,239	1,635	1,604
Beginning Balance at Mar. 31, 2021		49,658		1,962	48,186		43,761	2,680		(142)	(2)	(74)	1,472							16,530	16,528	9,143	7,400	(4)	(3)	(8)	2																	$ 1
Beginning Balance, in shares at Mar. 31, 2021																																												769,000,000
Beginning Balance (member's equity) at Mar. 31, 2021															13,466		13,473		(7)										9,470	7,674	7,677	(3)						4,896
Beginning Balance (parent) at Mar. 31, 2021																																	4,026	762	2,776	488			3,243	1,635	1,608
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		684			751			751					(67)
Net income		765													225		225											215	215	217	217		$ 39			39	103	103	$ (4)		(4)
Net income (loss)		698																		411	411		411
Other comprehensive (loss) income		(89)	[1]		(88)					(92)	4		(1)							2	2				1	1				1		1
Common stock issuances, including dividend reinvestment and employee benefits																																										$ 26	$ 26		$ 26
Common stock dividends		(744)			(744)			(744)							(300)		(300)
Contributions from noncontrolling interests, net of transaction costs	[2]	15											15
Distributions to noncontrolling interest in subsidiaries		(5)											(5)
Other					1		1						(1)		1		1			(1)	(2)		(2)				1			(1)	(1)
Ending 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
Ending Balance (member's equity) at Jun. 30, 2021															$ 13,392		$ 13,399		$ (7)									$ 9,685	$ 9,685	$ 7,891	$ 7,893	$ (2)					$ 4,999	$ 4,999
Ending Balance, in shares at Jun. 30, 2021		769,000,000																		100													90,000,000						100,000,000					769,000,000
Ending Balance (parent) at Jun. 30, 2021		$ 48,132																		$ 16,939													$ 4,065	$ 762	$ 2,776	$ 527			$ 3,239	$ 1,635	$ 1,604

[1] Net of income tax impacts of approximately $27 million for the three months ended June 30, 2021, and $19 million and $20 million for the six months ended June 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.