Condensed Consolidated Statements of Changes in 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 Available for Sale Securities [Member]	Pension and OPEB Related 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 Available for Sale Securities [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 Available for Sale Securities [Member]	Progress Energy [Member] Pension and OPEB Related Adjustments [Member]	Progress Energy [Member] Common Stockholders' Equity [Member]	Progress Energy [Member] Noncontrolling Interest [Member]	Duke Energy Progress [Member]	Duke Energy Progress [Member] Common Stock [Member]	Duke Energy Progress [Member] Retained Earnings [Member]	Duke Energy Progress [Member] Members Equity [Member]	Duke Energy Florida [Member]	Duke Energy Florida [Member] Common Stock [Member]	Duke Energy Florida [Member] Retained Earnings [Member]	Duke Energy Florida [Member] Members Equity [Member]	Duke Energy Florida [Member] Net 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]
Balance at Dec. 31, 2014	$ 40,899	$ 1	$ 39,405	$ 2,012	$ (439)	$ (59)	$ 3	$ (48)	$ 40,875	$ 24						$ 11,176	$ 7,467	$ 3,782	$ (35)	$ 1	$ (7)	$ 11,208	$ (32)	$ 5,867	$ 2,159	$ 3,708		$ 5,222	$ 1,762	$ 3,460			$ 4,674	$ 762	$ 4,782	$ (870)	$ 3,848	$ 1	$ 1,384	$ 2,460		$ 3
Balance, in shares at Dec. 31, 2014		707,000,000
Beginning member's equity at Dec. 31, 2014												$ 10,924	$ 10,937	$ (12)	$ (1)
Net Income	2,349			2,339					2,339	10						931		923				923	8
Net Income Attributable to Parent	2,339											940	940			923								497		355	$ 142	494		351	$ 143		129			129	222			222
Contribution from Parent																625	625					625		625			625
Distribution of membership interest of Duke Energy SAM, LLC to parent																																	(1,912)		(1,912)
Other comprehensive (loss) income, net of tax	(245)				(228)	(1)	(5)	(1)	(235)	(10)		2		1	$ 1				2	(1)	(1)																(2)					(2)
Common stock issuances, including dividend reinvestment and employee benefits, shares		1,000,000
Common stock issuances, including dividend reinvestment and employee benefits	48		48						48
Stock Repurchased During Period, Shares		(20,000,000)
Stock Repurchased During Period, Value	(1,500)		(1,500)						(1,500)
Common stock dividends	(1,685)			(1,685)					(1,685)																			(350)		(350)			(149)		(149)		(150)			(150)
Distributions to parent												(401)	(401)															(350)			(350)
Distributions to noncontrolling interest in subsidiaries	(7)									(7)						(4)							(4)
Other	9			(10)					(10)	19	[1]					1		(2)				(2)	3		$ (2,159)	$ (4,063)	6,222		$ (1,762)	$ (3,461)	5,223
Balance at Sep. 30, 2015	39,868	$ 1	37,953	2,656	(667)	(60)	(2)	(49)	39,832	36						12,729	8,092	4,703	(33)		(8)	12,754	(25)	6,989			6,989	5,016			5,016		2,742	762	2,721	(741)	3,918	1	1,384	2,532		1
Balance, in shares at Sep. 30, 2015		688,000,000
Ending member's equity at Sep. 30, 2015												11,465	11,476	(11)
Balance 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)										$ 2,784	762	2,720	(698)	$ 3,836	1	1,384	2,450		1
Balance, in shares at Dec. 31, 2015	688,000,000	688,000,000														100																	89,663,086				53,913,701
Beginning member's equity at Dec. 31, 2015												11,606	11,617	(11)										7,059			7,059	5,121			5,121
Net Income	$ 2,392			2,379					2,379	13						$ 935		927				927	8
Net Income Attributable to Parent	2,379											1,026	1,026			927								539			539	487			487		$ 171			171	$ 309				$ 309
Other comprehensive (loss) income, net of tax	88				92	(16)	7	2	85	3		1		1		8			4	2	2	8						2				$ 2					(1)					$ (1)
Common stock issuances, including dividend reinvestment and employee benefits, shares		1,000,000
Common stock issuances, including dividend reinvestment and employee benefits	29		29						29
Common stock dividends	(1,731)			(1,731)					(1,731)							(1,075)		(1,075)				(1,075)											(25)		(25)
Distributions to parent												(1,800)	(1,800)											(301)			(301)	(774)			(774)						(149)				(149)
Distributions to noncontrolling interest in subsidiaries	(3)									(3)						(1)							(1)
Other												(3)	(3)			3	4					4	(1)					3			3		9			9		$ (1)	$ (1,384)	$ (2,450)	3,835
Balance at Sep. 30, 2016	$ 40,546	$ 1	$ 37,997	$ 3,212	$ (600)	$ (66)	$ 4	$ (59)	$ 40,489	$ 57						$ 12,723	$ 8,096	$ 4,683	$ (27)	$ 2	$ (15)	$ 12,739	$ (16)										$ 2,939	$ 762	$ 2,695	$ (518)
Balance, in shares at Sep. 30, 2016	689,000,000	689,000,000														100																	89,663,086
Ending member's equity at Sep. 30, 2016												$ 10,830	$ 10,840	$ (10)										$ 7,297			$ 7,297	$ 4,839			$ 4,837	$ 2					$ 3,995				$ 3,995

[1] The $19 million change in Noncontrolling Interests for the nine months ended September 30, 2015, is primarily related to an acquisition of majority interest in a solar company.