Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions		Total		Preferred Stock [Member]	Common Stockholders' Equity [Member]		Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]		Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]		Net Unrealized (Losses) Gains on Available for Sale Securities [Member]		Pension and OPEB Adjustments [Member]		Noncontrolling Interest [Member]		Duke Energy Carolinas [Member]	Duke Energy Carolinas [Member] Member's Equity [Member]	Duke Energy Carolinas [Member] Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]	Progress Energy [Member]	Progress Energy [Member] Common Stockholders' Equity [Member]	Progress Energy [Member] Additional Paid-in Capital [Member]	Progress Energy [Member] Retained Earnings [Member]		Progress Energy [Member] Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]		Progress Energy [Member] Net Unrealized (Losses) Gains on Available for Sale Securities [Member]		Progress Energy [Member] Pension and OPEB Adjustments [Member]		Progress Energy [Member] Noncontrolling Interest [Member]	Duke Energy Progress [Member]	Duke Energy Florida [Member]	Duke Energy Florida [Member] Member's Equity [Member]		Duke Energy Florida [Member] Net Unrealized (Losses) Gains on Available for Sale Securities [Member]		Duke Energy Ohio [Member]		Duke Energy Ohio [Member] Common Stock [Member]	Duke Energy Ohio [Member] Additional Paid-in Capital [Member]		Duke Energy Ohio [Member] Retained Earnings [Member]	Duke Energy Indiana [Member]	Piedmont Natural Gas [Member]	Piedmont Natural Gas [Member] Common Stock [Member]	Piedmont Natural Gas [Member] Retained Earnings [Member]	Series A Preferred Stock [Member]		Series A Preferred Stock [Member] Preferred Stock [Member]	[5]	Series A Preferred Stock [Member] Common Stockholders' Equity [Member]	[5]	Series B Preferred Stock [Member]		Series B Preferred Stock [Member] Preferred Stock [Member]		Series B Preferred Stock [Member] Common Stockholders' Equity [Member]	[6]	Common Stock [Member]	Common Stock [Member] Common Stockholders' Equity [Member]	Common Stock [Member] Common Stock [Member]	Common Stock [Member] Additional Paid-in Capital [Member]
Beginning Balance at Dec. 31, 2017		$ 41,737			$ 41,739		$ 1	$ 38,792	$ 3,013		$ (10)		$ 12		$ (69)		$ (2)					$ 13,465	$ 13,468	$ 9,143	$ 4,350		$ (18)		$ 5		$ (12)		$ (3)
Beginning Balance, in shares at Dec. 31, 2017							700,000,000
Beginning Balance (member's equity) at Dec. 31, 2017																			$ 11,361	$ 11,368	$ (7)													$ 7,949	$ 5,618	$ 5,614		$ 4								$ 4,121
Beginning Balance (parent) at Dec. 31, 2017																																								$ 3,163		$ 762	$ 2,670		$ (269)		$ 1,662	$ 860	$ 802
Net income (attributable to parent)		2,202																	936	936		904												532	514	514				121					121	317	81		81
Net Income		2,190																				910	904		904								6
Net income		2,190			2,202				2,202								(12)
Other comprehensive income (loss)		13			13						15		(5)		3				1		1	6	6				5		(1)		2				(1)			(1)
Stock issuances, shares																																																																13,000,000
Stock issuances																																																														$ 955	$ 955		$ 955
Common stock dividends		(1,914)			(1,914)				(1,914)										(750)	(750)		(250)	(250)		(250)									(175)	(75)	(75)										(175)
Distributions to noncontrolling interest in subsidiaries		(1)															(1)					(1)											(1)
Other		33	[1]						12	[1]			(12)	[1]			33	[1]							5	[2]			(5)	[2]						5	[3]	(5)	[3]	106	[4]		106	[4]			300	300
Ending Balance at Sep. 30, 2018		43,013			42,995		$ 1	39,747	3,313		5		(5)		(66)		18					14,130	14,128	9,143	5,009		(13)		(1)		(10)		2
Ending Balance, in shares at Sep. 30, 2018							713,000,000
Ending Balance (member's equity) at Sep. 30, 2018																			11,548	11,554	(6)													8,306	6,056	6,058		(2)								4,263
Ending Balance (parent) at Sep. 30, 2018																																								3,390		762	2,776		(148)		2,043	1,160	883
Beginning Balance at Jun. 30, 2018		42,515			42,507		$ 1	39,682	2,894		2		(5)		(67)		8					13,972	13,972	9,143	4,855		(15)		(1)		(10)
Beginning Balance, in shares at Jun. 30, 2018							712,000,000
Beginning Balance (member's equity) at Jun. 30, 2018																			11,302	11,308	(6)													8,265	5,888	5,890		(2)								4,244
Beginning Balance (parent) at Jun. 30, 2018																																								3,290		762	2,776		(248)		2,064	1,160	904
Net income (attributable to parent)		1,082																	496	496		404												216	243	243				100					100	119	(21)		(21)
Net Income		1,066																				406	404		404								2
Net income		1,066			1,082				1,082								(16)
Other comprehensive income (loss)		4			4						3				1							2	2				2
Stock issuances, shares																																																																1,000,000
Stock issuances																																																														65	65		65
Common stock dividends		(663)			(663)				(663)										(250)	(250)		(250)	(250)		(250)									(175)	(75)	(75)										(100)
Other		26															26
Ending Balance at Sep. 30, 2018		43,013			42,995		$ 1	39,747	3,313		5		(5)		(66)		18					14,130	14,128	9,143	5,009		(13)		(1)		(10)		2
Ending Balance, in shares at Sep. 30, 2018							713,000,000
Ending Balance (member's equity) at Sep. 30, 2018																			11,548	11,554	(6)													8,306	6,056	6,058		(2)								4,263
Ending Balance (parent) at Sep. 30, 2018																																								$ 3,390		762	2,776		(148)		$ 2,043	1,160	883
Beginning Balance at Dec. 31, 2018		$ 43,834		$ 0	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					727,000,000															100																		90,000,000							100
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		$ 43,817																				$ 14,254																		$ 3,445		762	2,776		(93)		$ 2,091	1,160	931
Net income (attributable to parent)		3,047																	1,184	1,184		1,098												650	586	586				$ 190					190	363	97		97
Net Income		2,964																				1,098	1,098		1,098
Net income		2,937			3,047				3,047								(110)
Other comprehensive income (loss)		(47)			(47)						(58)		10		1							8	8				4		2		2				2			2
Stock issuances, shares																																																																2,000,000
Stock issuances																																																		$ 973	[5]	$ 973		$ 973		$ 990	[6]	$ 990	[6]	$ 990		158	158		158
Common stock dividends		(2,044)			(2,044)				(2,044)										(275)	(275)																										(200)
Sale of noncontrolling interest	[7]	408			(455)						10						863																																																$ (465)
Distributions to noncontrolling interest in subsidiaries		(1)															(1)
Other		(1)	[8]		(1)	[8]			23	[8]	(6)	[8]	(1)	[8]	(17)	[8]			(1)		(1)				7	[9]	(4)	[9]	(1)	[9]	(2)	[9]															$ 150	150
Contribution from noncontrolling interest in subsidiaries	[10]	200															200
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, in shares at Sep. 30, 2019																																																		40,000,000						1,000,000
Ending Balance, in shares at Sep. 30, 2019		729,000,000					729,000,000															100																		90,000,000							100
Ending Balance (member's equity) at Sep. 30, 2019																			12,591	12,598	(7)													9,091	6,683	6,683										4,502
Ending Balance (parent) at Sep. 30, 2019		$ 46,438																				$ 15,360																		$ 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
Net income (attributable to parent)		1,327																	590	590		521												278	289	289				$ 74					74	156	$ (18)		(18)
Net Income		1,323																				521	521		521
Net income		1,308			1,327				1,327								(19)
Other comprehensive income (loss)		(15)			(15)						(15)		2		(2)							2	2				1		1						1			$ 1
Stock issuances, shares																																																										1,000,000							1,000,000
Stock issuances																																																								$ 990	[6]	$ 990	[6]	$ 990		$ 69	$ 69		$ 69
Common stock dividends		(690)			(690)				(690)										(275)	(275)																										(200)
Sale of noncontrolling interest	[7]	408			(455)			(465)			10						863
Other		(2)			(1)			(1)									(1)					1							$ (1)		1		1
Contribution from noncontrolling interest in subsidiaries	[10]	7															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, in shares at Sep. 30, 2019																																																		40,000,000						1,000,000
Ending Balance, in shares at Sep. 30, 2019		729,000,000					729,000,000															100																		90,000,000							100
Ending Balance (member's equity) at Sep. 30, 2019																			$ 12,591	$ 12,598	$ (7)													$ 9,091	$ 6,683	$ 6,683										$ 4,502
Ending Balance (parent) at Sep. 30, 2019		$ 46,438																				$ 15,360																		$ 3,635		$ 762	$ 2,776		$ 97		$ 2,338	$ 1,310	$ 1,028

[1] Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income represent a cumulative-effect adjustment due to implementation of a new accounting standard related to Financial Instruments Classification and Measurement.

[2] Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income represent a cumulative-effect adjustment due to implementation of a new accounting standard related to Financial Instruments Classification and Measurement.

[3] Amounts in Member's Equity and Accumulated Other Comprehensive Income (Loss) represent a cumulative-effect adjustment due to implementation of a new accounting standard related to Financial Instruments Classification and Measurement.

[4] Represents a non-cash settlement through equity of an intercompany payable from Duke Energy Ohio to its parent.

[5] Duke Energy issued 40 million depositary shares of preferred stock, series A, in the first quarter of 2019.

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

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

[8] 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.

[9] 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.

[10] Relates to tax equity financing activity in the Commercial Renewables segment. See Note 1 for additional discussion.