Consolidated Statements of Equity - USD ($) $ in Millions	Total		Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]		Foreign Currency Translation Adjustments [Member]		Net Gains (Losses) on Cash Flow Hedges [Member]	Net Gains (Losses) on Cash Flow Hedges [Member]		Net Unrealized Gains (Losses) on Available-for-Sale Securities [Member]		Pension And OPEB Adjustments [Member]		Common Stockholders' Equity [Member]		Noncontrolling Interest [Member]		Duke Energy Carolinas [Member]	Duke Energy Carolinas [Member] Members Equity [Member]	Duke Energy Carolinas [Member] Net Gains (Losses) on Cash Flow Hedges [Member]	Duke Energy Carolinas [Member] Net Gains (Losses) on Cash Flow Hedges [Member]	Progress Energy [Member]		Progress Energy [Member] Additional Paid In Capital [Member]	Progress Energy [Member] Retained Earnings [Member]		Progress Energy [Member] Net Gains (Losses) on Cash Flow Hedges [Member]	Progress Energy [Member] Net Gains (Losses) on Cash Flow Hedges [Member]	Progress Energy [Member] Net Unrealized Gains (Losses) on Available-for-Sale Securities [Member]		Progress Energy [Member] Pension And OPEB Adjustments [Member]	Progress Energy [Member] Common Stockholders' Equity [Member]		Progress Energy [Member] Noncontrolling Interest [Member]		Duke Energy Progress [Member]	Duke Energy Progress [Member] Members Equity [Member]	Duke Energy Florida [Member]		Duke Energy Florida [Member] Members Equity [Member]		Duke Energy Florida [Member] Net Unrealized Gains (Losses) 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]	Duke Energy Indiana [Member] Common Stock [Member]	Duke Energy Indiana [Member] Additional Paid In Capital [Member]	Duke Energy Indiana [Member] Retained Earnings [Member]	Duke Energy Indiana [Member] Members Equity [Member]	Duke Energy Indiana [Member] Net Gains (Losses) on Cash Flow Hedges [Member]	Piedmont Natural Gas [Member]	Piedmont Natural Gas [Member] Common Stock [Member]	Piedmont Natural Gas [Member] Retained Earnings [Member]	Piedmont Natural Gas [Member] Net Gains (Losses) on Cash Flow Hedges [Member]
Beginning Balance (Attributable to Parent) at Oct. 31, 2015	$ (1)																																																							$ 1,426	$ 721	$ 706
Net Income Attributable to Parent																																																								193		193
Other comprehensive income (loss), net of tax																																																								1			$ 1
Common stock issuances, including dividend reinvestment and employee benefits																																																								139	139
Distributions/Dividends to parent																																																								(114)		(114)
Ending Balance (Attributable to Parent) at Oct. 31, 2016																																																								1,645	860	785
Beginning Balance (parent) at Dec. 31, 2015	39,771		$ 1	$ 37,968	$ 2,564		$ (692)			$ (50)		$ (3)		$ (61)		$ 39,727		$ 44						$ 12,853		$ 8,092	$ 4,831			$ (31)			$ (17)	$ 12,875		$ (22)
Beginning Members' Equity at Dec. 31, 2015																				$ 11,606	$ 11,617		$ (11)																$ 7,059
Beginning Balance (Attributable to Parent) at Dec. 31, 2015																																								$ 5,121		$ 5,121				$ 2,784	$ 762	$ 2,720	$ (698)	$ 3,836	$ 1	$ 1,384	$ 2,450		$ 1
Balance (in shares) at Dec. 31, 2015			688,000,000
Net income	2,170				2,152											2,152		18						1,041			1,031							1,031		10
Net Income Attributable to Parent	2,152																			1,166	1,166			1,031														$ 599	599	551		551				228			228	381				$ 381
Other comprehensive income (loss), net of tax	715	[1]					$ 692	[2]		30	[1]	2	[1]	(11)	[1]	713	[1]	2	[1]	2			2	10						8	$ 1		1	10						1				$ 1						(1)					$ (1)
Common stock issuances, including dividend reinvestment and employee benefits (in shares)			12,000,000
Common stock issuances, including dividend reinvestment and employee benefits	773			773												773
Distributions/Dividends to parent	(2,332)				(2,332)											(2,332)				(2,000)	(2,000)			(2,098)			(2,098)							(2,098)					(300)	(775)		(775)				(25)		(25)		(149)				(149)
Distributions to noncontrolling interest in subsidiaries	(6)																	(6)						(1)												(1)
Other	(50)	[3]																(50)	[3]	(2)	(2)			2		2								2						2		2				9			9		$ (1)	$ (1,384)	$ (2,450)	3,835
Balance (in shares) at Dec. 31, 2016			700,000,000
Ending Balance (parent) at Dec. 31, 2016	41,041		$ 1	38,741	2,384					(20)		(1)		(72)		41,033		8						11,807		8,094	3,764			(23)	1		(16)	11,820		(13)
Ending member's equity at Dec. 31, 2016																				10,772	10,781		(9)																7,358	4,900		4,899		1
Ending Balance (Attributable to Parent) at Dec. 31, 2016																																														2,996	762	2,695	(461)	4,067				4,067		1,672	860	812
Beginning Balance (Attributable to Parent) at Oct. 31, 2016																																																								1,645	860	785
Net Income Attributable to Parent																																																								54		54
Distributions/Dividends to parent																																																								(27)		(27)
Balance (in shares) at Dec. 31, 2016			700,000,000
Ending Balance (parent) at Dec. 31, 2016	41,041		$ 1	38,741	2,384					(20)		(1)		(72)		41,033		8						11,807		8,094	3,764			(23)	1		(16)	11,820		(13)
Ending member's equity at Dec. 31, 2016																				10,772	10,781		(9)																7,358	4,900		4,899		1
Ending Balance (Attributable to Parent) at Dec. 31, 2016																																														2,996	762	2,695	(461)	4,067				4,067		1,672	860	812
Net income	3,064				3,059											3,059		5						1,268			1,258							1,258		10
Net Income Attributable to Parent	3,059																			1,214	1,214			1,258														715	715	712		712				192			192	354				354		139		139
Other comprehensive income (loss), net of tax	26									$ 10		13		3		26				2			$ 2	13						$ 5	4		4	13						3				3
Common stock issuances, including dividend reinvestment and employee benefits	51			51												51
Distributions/Dividends to parent	(2,450)				(2,450)											(2,450)				(625)	(625)			(672)	[2]		(672)	[2]						(672)	[2]				(124)							$ (25)		(25)		(300)				(300)
Distributions to noncontrolling interest in subsidiaries	(2)																	(2)
Equitization of certain notes payable to affiliates																								1,047		1,047								1,047
Other	$ 7	[4]			20	[4]										20	[4]	(13)	[4]	(2)	(2)			$ 2		2								2						3		3														$ 149		149
Balance (in shares) at Dec. 31, 2017	700,000,000		700,000,000																					100																						90,000,000										100
Ending Balance (parent) at Dec. 31, 2017	$ 41,737		$ 1	38,792	3,013				$ (10)			12		(69)		41,739		(2)						$ 13,465		9,143	4,350		$ (18)		5		(12)	13,468		(3)
Ending member's equity at Dec. 31, 2017																				11,361	11,368	$ (7)																7,949	7,949	5,618		5,614		4						4,121				4,121
Ending Balance (Attributable to Parent) at Dec. 31, 2017	41,739																							13,468																						$ 3,163	762	2,670	(269)							$ 1,662	860	802
Net income	2,644				2,666											2,666		(22)						1,033			1,027							1,027		6
Net Income Attributable to Parent	2,666																			1,071	1,071			1,027														667	667	554		554				176			176	393				393		129
Other comprehensive income (loss), net of tax	(13)								(4)			(3)		(6)		(13)				1				10					6		(1)		5	10						(1)				(1)
Common stock issuances, including dividend reinvestment and employee benefits (in shares)			27,000,000
Common stock issuances, including dividend reinvestment and employee benefits	2,003			2,003												2,003
Distributions/Dividends to parent	(2,578)				(2,578)											(2,578)				(750)	(750)			(250)			(250)							(250)					(175)	(75)		(75)								(175)				(175)
Distributions to noncontrolling interest in subsidiaries	(1)																	(1)						$ (1)												(1)
Capital contribution from parent																																														$ 106		106								300
Other	$ 42	[5]			12	[5]						(12)	[5]					42	[5]								4	[6]			(5)	[6]		(1)	[6]	1	[6]			(1)	[7]	(4)	[7]	5	[7]											$ 300	300
Balance (in shares) at Dec. 31, 2018	727,000,000		727,000,000																					100																						90,000,000										100
Ending Balance (parent) at Dec. 31, 2018	$ 43,834		$ 1	$ 40,795	$ 3,113				$ (14)			$ (3)		$ (75)		$ 43,817		$ 17						$ 14,257		$ 9,143	$ 5,131		$ (12)		$ (1)		$ (7)	$ 14,254		$ 3
Ending member's equity at Dec. 31, 2018																				$ 11,683	$ 11,689	$ (6)																$ 8,441	$ 8,441	$ 6,095		$ 6,097		$ (2)						$ 4,339				$ 4,339
Ending Balance (Attributable to Parent) at Dec. 31, 2018	$ 43,817																							$ 14,254																						$ 3,445	$ 762	$ 2,776	$ (93)							$ 2,091	$ 1,160	$ 931

[1] Foreign Currency Translation Adjustments amount includes $620 million of cumulative adjustment realized as a result of the sale of the Latin American generation business. See Note 2 to the Consolidated Financial Statements.

[2] Includes a $547 million non-cash dividend related to a legal entity restructuring.

[3] Noncontrolling Interests amount is primarily related to the sale of the Latin American generation business. See Note 2 to the Consolidated Financial Statements.

[4] Retained Earnings relates to a cumulative-effect adjustment due to implementation of a new accounting standard related to stock-based compensation and the associated income taxes. See Note 1 to the Consolidated Financial Statements for additional information. Noncontrolling Interests relates to the purchase of remaining interest in REC Solar.

[5] 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. See Note 1 for more information. Amount in Noncontrolling Interests primarily relates to tax equity financing activity in the Commercial Renewables segment.

[6] 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. See Note 1 for more information.

[7] Amounts represent a cumulative-effect adjustment due to implementation of a new accounting standard related to Financial Instruments Classification and Measurement. See Note 1 for more information.