Condensed Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ 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
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)	851			899				899					(48)
Net income	938														339		339											$ 204	204	120	120		65			65	$ 99	99	178		178
Net income	890																			283	283		283
Other comprehensive (loss) income	(77)	[1]		(63)						(65)	1	1	(14)							2	2			1	1					1		1
Common stock issuances, including dividend reinvestment and employee benefits																																										$ 50	$ 50		$ 50
Common stock issuances, including dividend reinvestment and employee benefits (in shares)																																												2
Common stock dividends	(695)			(695)				(695)							(300)		(300)
Contributions from noncontrolling interests, net of transaction costs	103												103
Distributions to noncontrolling interest in subsidiaries	(7)												(7)
Other	(93)	[2]		(92)	[2]	(1)	[2]	(91)	[2]				(1)	[2]	(13)	[3]	(13)	[3]		(1)	(1)		(1)																(1)		(1)
Ending 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
Ending Balance (member's equity) at Mar. 31, 2020															12,837		12,844		(7)										9,450	6,909	6,909							4,674
Ending Balance, in shares at Mar. 31, 2020																																												735
Ending Balance (parent) at Mar. 31, 2020																																	$ 3,748	762	2,776	210			$ 2,620	1,310	1,310
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																																90						100					769
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)	902			953				953					(51)
Net income	992														312		312											210	210	117	117		$ 91			91	112	112	203		203
Net income	941																			290	290		290
Other comprehensive (loss) income	26	[1]		19						25	(8)	2	7											1	(1)					(1)		(1)
Common stock issuances, including dividend reinvestment and employee benefits																																										$ (3)	$ (3)		$ (3)
Common stock dividends	(744)			(744)				(744)
Contributions from noncontrolling interests, net of transaction costs	300			(3)		(3)							303
Distributions to noncontrolling interest in subsidiaries	(7)												(7)							(1)							(1)
Other																					1		1				(1)											1
Contribution from parent																																							$ 325	325
Ending 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
Ending Balance (member's equity) at Mar. 31, 2021															$ 13,466		$ 13,473		$ (7)									$ 9,470	$ 9,470	$ 7,674	$ 7,677	$ (3)					$ 4,896	$ 4,896
Ending Balance, in shares at Mar. 31, 2021	769																																90						100					769
Ending Balance (parent) at Mar. 31, 2021	$ 48,186																			$ 16,528													$ 4,026	$ 762	$ 2,776	$ 488			$ 3,243	$ 1,635	$ 1,608

[1] Net of income tax impacts of approximately $8 million and $23 million for the three months ended March 31, 2021, and 2020, respectively.

[2] 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.

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