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 Cash Flow Hedges [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] Net Gains (Losses) on Cash Flow Hedges [Member]
Balance at Dec. 31, 2013	$ 41,408	$ 1	$ 39,365	$ 2,363	$ (307)	$ (40)		$ (52)	$ 41,330	$ 78					$ 10,864	$ 7,467	$ 3,452	$ (43)		$ (16)	$ 10,860	$ 4	$ 5,625	$ 2,159	$ 3,466		$ 4,797	$ 1,762	$ 3,036		$ (1)	$ 5,269	$ 762	$ 4,882	$ (375)	$ 3,939	$ 1	$ 1,384	$ 2,551	$ 3
Balance, in shares at Dec. 31, 2013		706,000,000
Beginning member's equity at Dec. 31, 2013											$ 10,350	$ 10,365	$ (14)	$ (1)
Net income (loss)	1,789			1,786					1,786	3					735		733				733	2
Net Income (Loss) Attributable to Parent	1,786										933	933			733								391		391		455		455			(558)			(558)	301			301
Other comprehensive (loss) income, net of tax	(52)				(55)	(5)	$ 2	1	(57)	5	2		2		8			5	$ 1	2	8						1				$ 1
Common stock issuances, including dividend reinvestment and employee benefits, shares		1,000,000
Common stock issuances, including dividend reinvestment and employee benefits	23		23						23
Common stock dividends	(1,670)			(1,670)					(1,670)														(224)		(224)		(124)		(124)			(100)		(100)		(451)			(451)
Distributions to parent											(376)	(376)
Distributions to noncontrolling interest in subsidiaries	(45)									(45)					(37)							(37)
Transfer of service company net assets to Duke Energy															(538)		(538)				(538)
Balance at Sep. 30, 2014	41,453	$ 1	39,388	2,479	(362)	(45)	2	(51)	41,412	41					11,032	7,467	3,647	(38)	1	(14)	11,063	(31)	5,792	2,159	3,633		5,129	1,762	3,367			4,611	762	4,782	(933)	3,789	1	1,384	2,401	3
Balance, in shares at Sep. 30, 2014		707,000,000
Ending member's equity at Sep. 30, 2014											10,909	10,922	(12)	(1)
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	707,000,000													100								160,000,000				100					89,663,086				53,913,701
Beginning member's equity at Dec. 31, 2014											10,924	10,937	(12)	(1)
Net income (loss)	$ 2,349			2,339					2,339	10					$ 931		923				923	8
Net Income (Loss) Attributable to Parent	2,339										940	940			923								$ 497		355	$ 142	$ 494		351	$ 143		$ 129			129	$ 222			222
Other comprehensive (loss) income, net of tax	(245)				(228)	(1)	(5)	(1)	(235)	(10)	2		1	$ 1	0			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 repurchase, Shares	(19,800,000)	(20,000,000)
Stock Repurchase	$ (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		(2)				(2)	3		$ (2,159)	$ (4,063)	6,222		$ (1,762)	$ (3,461)	5,223
Contributions from parent															625	625					625		625			625
Distribution of membership interest of Duke Energy SAM, LLC to parent																																(1,912)		(1,912)
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)										$ 2,742	$ 762	$ 2,721	$ (741)	$ 3,918	$ 1	$ 1,384	$ 2,532	$ 1
Balance, in shares at Sep. 30, 2015	688,000,000	688,000,000													100																	89,663,086				53,913,701
Ending member's equity at Sep. 30, 2015											$ 11,465	$ 11,476	$ (11)										$ 6,989			$ 6,989	$ 5,016			$ 5,016