Condensed Consolidated Statements of Changes in Equity (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Foreign Currency 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] Common Stock [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] 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 Florida [Member]	Duke Energy Florida [Member] Common Stock [Member]	Duke Energy Florida [Member] Retained Earnings [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 Ohio [Member] Pension and OPEB Related Adjustments [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]
Beginning member's equity at Dec. 31, 2012											$ 9,872	$ 9,888	$ (15)	$ (1)
Balance at Dec. 31, 2012	40,941	1	39,279	1,889	(116)	(100)		(90)	40,863	78					10,185	0	7,465	2,783	(42)	(25)	10,181	4	5,127	2,159	2,968	4,799	1,762	3,037	0	5,166	762	4,882	(477)	(1)	3,708	1	1,384	2,318	5
Balance, in shares at Dec. 31, 2012		704,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	976			973					973	3					137			136			136	1		0
Net Income (Loss) Attributable to Parent	973										425	425			136								187		187	53		53		37			37		172			172
Other comprehensive income (loss), net of tax	(74)				(125)	54	(4)	5	(70)	(4)					4				3	1	4									1				1	(1)				(1)
Common stock issuances, including dividend reinvestment and employee benefits	5		5						5
Common stock issuances, including dividend reinvestment and employee benefits, shares		2,000,000
Common stock dividends	(1,636)			(1,636)					(1,636)																	(225)		(225)
Distributions to parent											(249)	(249)
Premium on the redemption of preferred stock of subsidiaries	(3)			(3)					(3)						(3)			(3)			(3)		(2)	0	(2)	(1)		(1)
Changes in noncontrolling interest in subsidiaries	(8)									(8)
Distribution to noncontrolling interest in subsidiaries															(2)							(2)
Ending member's equity at Jun. 30, 2013											10,048	10,064	(15)	(1)
Balance at Jun. 30, 2013	40,201	1	39,284	1,223	(241)	(46)	(4)	(85)	40,132	69					10,321	0	7,465	2,916	(39)	(24)	10,318	3	5,312	2,159	3,153	4,626	1,762	2,864	0	5,204	762	4,882	(440)	0	3,879	1	1,384	2,490	4
Balance, in shares at Jun. 30, 2013		706,000,000
Beginning member's equity at Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	342														(17)
Net Income (Loss) Attributable to Parent	339										181				(17)								77			(57)				58					82
Other comprehensive income (loss), net of tax	(91)														2
Ending member's equity at Jun. 30, 2013											10,048
Balance at Jun. 30, 2013	40,201														10,321	0	7,465						5,312			4,626	1,762		0	5,204	762	4,882			3,879
Beginning member's equity at Dec. 31, 2013											10,350	10,365	(14)	(1)
Balance at Dec. 31, 2013	41,408	1	39,365	2,363	(307)	(40)		(52)	41,330	78					10,864	0	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)	0	3,939	1	1,384	2,551	3
Balance, in shares at Dec. 31, 2013	706,000,000	706,000,000													100								160,000,000			100				89,663,086					53,913,701
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	520			512					512	8					405			404			404	1		0
Net Income (Loss) Attributable to Parent	512										556	556			404								234		234	250		250		(997)			(997)		200			200
Other comprehensive income (loss), net of tax	45				51	(9)	2		44	1	2		2		5				4	1	5					1			1
Common stock issuances, including dividend reinvestment and employee benefits	24		24						24
Common stock issuances, including dividend reinvestment and employee benefits, shares		1,000,000
Common stock dividends	(1,107)			(1,107)					(1,107)														(125)		(125)	(124)		(124)		(100)		(100)			(225)			(225)
Distributions to parent											(251)	(251)
Distribution to noncontrolling interest in subsidiaries	(9)									(9)					(2)							(2)
Transfer of service company net assets to Duke Energy															(539)			(539)			(539)
Ending member's equity at Jun. 30, 2014											10,657	10,670	(12)	(1)
Balance at Jun. 30, 2014	40,881	1	39,389	1,768	(256)	(49)	2	(52)	40,803	78					10,733	0	7,467	3,317	(39)	(15)	10,730	3	5,734	2,159	3,575	4,924	1,762	3,162	0	4,172	762	4,782	(1,372)	0	3,914	1	1,384	2,526	3
Balance, in shares at Jun. 30, 2014	707,000,000	707,000,000													100								160,000,000			100				89,663,086					53,913,701
Beginning member's equity at Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	613														202
Net Income (Loss) Attributable to Parent	609										270				202								101			142				(107)					87
Other comprehensive income (loss), net of tax	22														4
Ending member's equity at Jun. 30, 2014											10,657
Balance at Jun. 30, 2014	$ 40,881														$ 10,733	$ 0	$ 7,467						$ 5,734			$ 4,924	$ 1,762			$ 4,172	$ 762			$ 0	$ 3,914
Balance, in shares at Jun. 30, 2014	707,000,000														100								160,000,000			100				89,663,086					53,913,701