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]	Common Stock [Member]	Common Stock [Member] Common Stockholders' Equity [Member]	Common Stock [Member] Common Stock [Member]	Common Stock [Member] Additional Paid-in Capital [Member]	Preferred Stock [Member]		Preferred Stock [Member] Preferred Stock [Member]		Preferred Stock [Member] Common Stockholders' Equity [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)		1,120																		440	440		500																316	271		271				21			21	198	102		102
Net Income		1,124																					504		500				500								4
Net income		1,124			1,120					1,120								4
Other comprehensive income (loss)		9			9							12		(5)		2				1		1	4		4						3		(1)		2					(1)				(1)
Stock issuances, shares																																																								12,000,000
Stock issuances																																																						$ 890	$ 890		$ 890
Common stock dividends		(1,251)			(1,251)					(1,251)										(500)	(500)																													(75)
Distributions to noncontrolling interest in subsidiaries		(1)																(1)					(1)														(1)
Other		7	[1]		0	[1]				12	[1]			(12)	[1]			7	[1]						0	[2]	0	[2]	5	[2]			(5)	[2]						0	[3]	5	[3]	(5)	[3]	106		106			300	300
Distributions to noncontrolling interest in subsidiaries		(1)																(1)					(1)														(1)
Ending 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)
Ending Balance, in shares at Jun. 30, 2018							712,000,000
Ending Balance (member's equity) at Jun. 30, 2018																				11,302	11,308	(6)																	8,265	5,888		5,890		(2)						4,244
Ending Balance (parent) at Jun. 30, 2018																																														3,290	762	2,776	(248)		2,064	1,160	904
Beginning Balance at Mar. 31, 2018		41,798			41,792		$ 1	38,839		3,021		3		(4)		(68)		6					13,703		13,704		9,142		4,591		(16)		(1)		(12)		(1)
Beginning Balance, in shares at Mar. 31, 2018							701,000,000
Beginning Balance (member's equity) at Mar. 31, 2018																				11,435	11,441	(6)																	8,126	5,721		5,723		(2)						4,221
Beginning Balance (parent) at Mar. 31, 2018																																														3,138	762	2,670	(294)		1,772	860	912
Net income (attributable to parent)		500																		117	117		265																139	168		168				46			46	98	(8)		(8)
Net Income		502																					267		265				265								2
Net income		502			500					500								2
Other comprehensive income (loss)		(2)			(2)							(1)		(2)		1							2		2						1		(1)		2					(1)				(1)
Stock issuances, shares																																																								11,000,000
Stock issuances																																																						843	843		843
Common stock dividends		(626)			(626)					(626)										(250)	(250)																													(75)
Distributions to noncontrolling interest in subsidiaries																							(1)														(1)
Other		0			0					(1)				1									1	[2]	1	[2]	1	[2]	(1)	[2]			1	[2]						0	[3]	(1)	[3]	1	[3]	106		106			300	300
Distributions to noncontrolling interest in subsidiaries																							(1)														(1)
Ending 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)
Ending Balance, in shares at Jun. 30, 2018							712,000,000
Ending Balance (member's equity) at Jun. 30, 2018																				11,302	11,308	(6)																	8,265	5,888		5,890		(2)						4,244
Ending Balance (parent) at Jun. 30, 2018																																														$ 3,290	762	2,776	(248)		$ 2,064	1,160	904
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)		1,720																		594	594		577																372	297		297				$ 116			116	207	115		115
Net Income		1,641																					577		577				577								0
Net income		1,629			1,720					1,720								(91)
Other comprehensive income (loss)		(32)			(32)							(43)		8		3							6		6						3		1		2					1				1
Stock issuances, shares																																																								1,000,000				40,000,000
Stock issuances																																																						89	89		89	$ 973	[4]	$ 973	[4]	$ 973	[4]
Common stock dividends		(1,354)			(1,354)					(1,354)
Distributions to noncontrolling interest in subsidiaries		(1)																(1)
Other		1	[5]		0	[5]		1	[5]	23	[5]	(6)	[5]	(1)	[5]	(17)	[5]	1	[5]	(1)		(1)	(1)	[6]					7	[6]	(4)	[6]	0	[6]	(3)	[6]	(1)	[6]													$ 150	150
Distributions to noncontrolling interest in subsidiaries		(1)																(1)
Contribution from noncontrolling interest in subsidiaries	[7]	193																193
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		40,000,000
Ending Balance, in shares at Jun. 30, 2019		728,000,000					728,000,000																100																							90,000,000					100
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		$ 45,213																					$ 14,837																							$ 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 (attributable to parent)		820																		301	301		328																169	201		201				$ 47			47	97	(7)		(7)
Net Income		748																					329		328				328								1
Net income		736			820					820								(84)
Other comprehensive income (loss)		(20)			(20)							(27)		4		3							3		3						1		$ 1		1
Stock issuances																																																						$ 61	$ 61		$ 61	$ (1)		$ (1)		$ (1)
Common stock dividends		(678)			(678)					(678)
Distributions to noncontrolling interest in subsidiaries		(1)																(1)
Other		(3)			1			1				0						(4)					(1)						1						(1)		(1)														$ 150	150
Distributions to noncontrolling interest in subsidiaries		(1)																(1)
Contribution from noncontrolling interest in subsidiaries		193																193
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		40,000,000
Ending Balance, in shares at Jun. 30, 2019		728,000,000					728,000,000																100																							90,000,000					100
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		$ 45,213																					$ 14,837																							$ 3,561	$ 762	$ 2,776	$ 23		$ 2,356	$ 1,310	$ 1,046

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

[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 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.

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