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	1,414			1,407					1,407	7						480		475				475	5
Net Income Attributable to Parent	1,407											557	557			475								268		268		278		278			97			97	176			176
Distribution of membership interest of Duke Energy SAM, LLC to parent																																	(1,912)		(1,912)
Other comprehensive (loss) income, net of tax	(110)				(111)	7	(3)	2	(105)	(5)									(1)	(1)	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	28		28						28
Stock Repurchased During Period, Shares		(20,000,000)
Stock Repurchased During Period, Value	(1,500)		(1,500)						(1,500)
Common stock dividends	(1,115)			(1,115)					(1,115)																			(350)		(350)							(150)			(150)
Distributions to parent												(100)	(100)
Distributions to noncontrolling interest in subsidiaries	(7)									(7)						(4)							(4)
Other	8			(10)					(10)	18	[1]					2		(2)				(2)	4
Balance at Jun. 30, 2015	39,617	$ 1	37,933	2,294	(550)	(52)		(46)	39,580	37						11,654	7,467	4,255	(36)		(5)	11,681	(27)	6,135	$ 2,159	$ 3,976		5,150	$ 1,762	$ 3,388			2,859	762	2,870	(773)	3,873	1	1,384	2,486		2
Balance, in shares at Jun. 30, 2015		688,000,000
Ending member's equity at Jun. 30, 2015												11,381	11,394	(12)	$ (1)
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	$ 1,211			1,203					1,203	8						$ 486		481				481	5
Net Income Attributable to Parent	1,203											532	532			481								268			268	281			281		$ 82			82	$ 180				$ 180
Other comprehensive (loss) income, net of tax	93				103	(23)	7	2	89	4		1		1		6			3	1	2	6						1				$ 1					(1)					$ (1)
Common stock issuances, including dividend reinvestment and employee benefits, shares		1,000,000
Common stock issuances, including dividend reinvestment and employee benefits	16		16						16
Common stock dividends	(1,140)			(1,140)					(1,140)							(651)		(651)				(651)											(25)		(25)
Distributions to parent												(1,200)	(1,200)															(649)			(649)						(149)				(149)
Distributions to noncontrolling interest in subsidiaries	(3)									(3)						(1)							(1)
Other																																						$ (1)	$ (1,384)	$ (2,450)	3,835
Balance at Jun. 30, 2016	$ 39,948	$ 1	$ 37,984	$ 2,627	$ (589)	$ (73)	$ 4	$ (59)	$ 39,895	$ 53						$ 12,693	$ 8,092	$ 4,661	$ (28)	$ 1	$ (15)	$ 12,711	$ (18)										$ 2,841	$ 762	$ 2,695	$ (616)
Balance, in shares at Jun. 30, 2016	689,000,000	689,000,000														100																	89,663,086
Ending member's equity at Jun. 30, 2016												$ 10,939	$ 10,949	$ (10)										$ 7,327			$ 7,327	$ 4,754			$ 4,753	$ 1					$ 3,866				$ 3,866

[1] The $18 million change in Noncontrolling Interests is primarily related to an acquisition of majority interest in a solar company for an insignificant amount of cash consideration.