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]	[4]	Preferred Stock [Member] Preferred Stock [Member]		Preferred Stock [Member] Common Stockholders' Equity [Member]	[4]
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	622			620				620								2					237		235				235								2
Net income (attributable to parent)	620																	323	323		235															177	103		103				(25)			(25)	100	110		110
Other comprehensive income (loss)	11			11						13		(3)		1				1		1	2		2						2								0
Stock issuances, shares																																																					1,000,000
Stock issuances																																																			$ 47	$ 47		$ 47
Common stock dividends	(625)			(625)				(625)										(250)	(250)
Distributions to noncontrolling interest in subsidiaries	(1)															(1)
Other	7	[1]		0	[1]			13	[1]			(13)	[1]			7	[1]				(1)	[2]	(1)	[2]	(1)	[2]	6	[2]			(6)	[2]					0	[3]	6	[3]	(6)	[3]
Ending 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)
Ending Balance, in shares at Mar. 31, 2018						701,000,000
Ending Balance (member's equity) at Mar. 31, 2018																		11,435	11,441	(6)																8,126	5,721		5,723		(2)						4,221
Ending Balance (parent) at Mar. 31, 2018																																											$ 3,138	762	2,670	(294)		$ 1,772	860	912
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	893			900				900								(7)					248		249				249								(1)
Net income (attributable to parent)	900																	293	293		249															203	96		96				$ 69			69	110	$ 122		122
Other comprehensive income (loss)	(12)			(12)						(16)		4									3		3						2				1				1				1
Stock issuances, shares																																																					1,000,000				40,000,000
Stock issuances																																																			$ 28	$ 28		$ 28	$ 974		$ 974	[4]	$ 974
Common stock dividends	(676)			(676)				(676)
Other	4	[5]		(1)	[5]			23	[5]	(6)	[5]	$ (1)	[5]	(17)	[5]	5	[5]	(1)		(1)							6	[6]	(4)	[6]	0	[6]	(2)	[6]
Ending 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
Ending Balance, in shares at Mar. 31, 2019	40,000,000
Ending Balance, in shares at Mar. 31, 2019	728,000,000					728,000,000															100																						90,000,000					100
Ending Balance (member's equity) at Mar. 31, 2019																		$ 11,975	$ 11,982	$ (7)																$ 8,644	$ 6,192		$ 6,193		$ (1)						$ 4,449
Ending Balance (parent) at Mar. 31, 2019	$ 45,030																				$ 14,506																						$ 3,514	$ 762	$ 2,776	$ (24)		$ 2,213	$ 1,160	$ 1,053

[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 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 as a result of the adoption of Accounting Standards Update 2018-02: 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 as a result of the adoption of Accounting Standards Update 2018-02: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.