Consolidated Statements of Equity - USD ($) $ in Millions		Total		Preferred Stock	Common Stock	Additional Paid In Capital	Retained Earnings		Net Gains (Losses) on Cash Flow Hedges	Net Gains (Losses) on Cash Flow Hedges		Net Unrealized Gains (Losses) on Available-for-Sale Securities		Pension and OPEB Adjustments		Common Stockholders' Equity		Noncontrolling Interests		Duke Energy Carolinas	Duke Energy Carolinas Members Equity	Duke Energy Carolinas Net Gains (Losses) on Cash Flow Hedges	Duke Energy Carolinas Net Gains (Losses) on Cash Flow Hedges	Progress Energy		Progress Energy Additional Paid In Capital		Progress Energy Retained Earnings		Progress Energy Net Gains (Losses) on Cash Flow Hedges	Progress Energy Net Gains (Losses) on Cash Flow Hedges		Progress Energy Net Unrealized Gains (Losses) on Available-for-Sale Securities		Progress Energy Pension and OPEB Adjustments		Progress Energy Common Stockholders' Equity		Progress Energy Noncontrolling Interests		Duke Energy Progress	Duke Energy Progress Members Equity	Duke Energy Florida		Duke Energy Florida Members Equity		Duke Energy Florida Net Unrealized Gains (Losses) 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 Members Equity	Piedmont	Piedmont Common Stock	Piedmont Retained Earnings	Series A Preferred Stock	[7]	Series A Preferred Stock Preferred Stock	[7]	Series A Preferred Stock Common Stockholders' Equity	[7]	Series B Preferred Stock	[8]	Series B Preferred Stock Preferred Stock	[8]	Series B Preferred Stock Common Stockholders' Equity	[8]
Beginning 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)
Beginning Members' Equity at Dec. 31, 2016																				$ 10,772	$ 10,781	$ (9)																				$ 7,358	$ 4,900		$ 4,899		$ 1							$ 4,067
Beginning Balance (Attributable to Parent) at Dec. 31, 2016																																																	$ 2,996	$ 762	$ 2,695	$ (461)			$ 1,672	$ 860	$ 812
Balance (in shares) at Dec. 31, 2016					700,000,000
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	[1]						$ 10			13		3		26				2		$ 2		13						$ 5			4		4		13						3				3
Stock issuances		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)
Distributions to noncontrolling interest in subsidiaries		(2)																(2)
Equitization of certain notes payable to affiliates																								1,047		1,047											1,047
Other		7	[3]				20	[3]								20	[3]	(13)	[3]	(2)	(2)			2		2											2						3		3										(149)		(149)
Balance (in shares) at Dec. 31, 2017					700,000,000
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	5,618		5,614		4							4,121
Ending Balance (Attributable to Parent) at Dec. 31, 2017																																																	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		129
Contribution from parent																																																	$ 106		106				(300)	(300)
Other comprehensive income (loss), net of tax		(13)	[1]							(4)		(3)		(6)		(13)				1			1	10							6		(1)		5		10						(1)				(1)
Stock issuances, shares					27,000,000
Stock issuances		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)
Contribution from parent																																																							$ 300
Distributions to noncontrolling interest in subsidiaries		(1)																(1)						(1)															(1)
Other		$ 42	[4]				12	[4]				(12)	[4]					42	[4]					$ 0	[5]	0	[5]	4	[5]				(5)	[5]			(1)	[5]	1	[5]			(1)	[6]	4	[6]	(5)	[6]
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
Net income		3,571																						1,327				1,327									1,327		0
Net income		3,530					3,707									3,707		(177)
Net Income Attributable to Parent		3,748																		1,403	1,403			1,327																	805	805	692		692				$ 238			238	436	436	202		202
Contribution from parent																																																							(150)	(150)
Other comprehensive income (loss), net of tax		(24)	[1]							(41)		8		9		(24)								8							5		1		2		8						1				1
Stock issuances, shares					6,000,000
Stock issuances		552				552										552																																										$ 973		$ 973		$ 973		$ 989		$ 989		$ 989
Distributions/Dividends to parent		(2,735)					(2,735)									(2,735)				(275)	(275)																																	(200)
Contribution from parent																																																							$ 150
Sale of noncontrolling interest	[9]	407				(466)				10						(456)		863
Contribution from noncontrolling interest		428																428
Distributions to noncontrolling interest in subsidiaries		(4)																(4)
Other		$ 1	[10]				23	[10]		(6)	[10]	(2)	[10]	(16)	[10]	(1)	[10]	2	[10]	0	1		(1)	$ 1	[11]			7	[11]		(3)	[11]	(1)	[11]	(2)	[11]	1	[11]
Balance (in shares) at Dec. 31, 2019		733,000,000			733,000,000																			100																									90,000,000						100
Ending Balance (parent) at Dec. 31, 2019		$ 47,951		$ 1,962	$ 1	$ 40,881	$ 4,108			$ (51)		$ 3		$ (82)		$ 46,822		$ 1,129						$ 15,593		$ 9,143		$ 6,465			$ (10)		$ (1)		$ (7)		$ 15,590		$ 3
Ending member's equity at Dec. 31, 2019																				$ 12,811	$ 12,818		$ (7)																		$ 9,246	$ 9,246	$ 6,788		$ 6,789		$ (1)						$ 4,575	$ 4,575
Ending Balance (Attributable to Parent) at Dec. 31, 2019		$ 46,822																						$ 15,590																									$ 3,683	$ 762	$ 2,776	$ 145			$ 2,443	$ 1,310	$ 1,133

[1] Tax impacts are insignificant for all periods presented.

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

[3] 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.

[4] Amounts in Retained Earnings and AOCI 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.

[5] Amounts in Retained Earnings and AOCI 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.

[6] 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.

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

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

[9] See Note 3 for additional discussion of the transaction. (f) Amounts in Retained Earnings and AOCI 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] Amounts in Retained Earnings and AOCI 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.

[11] Amounts in Retained Earnings and AOCI 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.