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	867			864					864	3						263		260				260	3										149
Net Income Attributable to Parent	864											292	292			260								183		183		113		113			149			149	108			108
Other comprehensive (loss) income, net of tax	(133)				(121)	(3)		(5)	(129)	(4)						(1)			(2)		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	8		8						8
Common stock dividends	(564)			(564)					(564)																			(350)		(350)
Other	10			(3)					(3)	13	[1]							(3)				(3)	3
Balance at Mar. 31, 2015	41,087	$ 1	39,413	2,309	(560)	(62)	3	(53)	41,051	36						11,438	7,467	4,039	(37)	1	(6)	11,464	(26)	6,050	$ 2,159	$ 3,891		4,985	$ 1,762	$ 3,223			4,823	762	4,782	(721)	3,955	1	1,384	2,568		2
Balance, in shares at Mar. 31, 2015		708,000,000
Ending member's equity at Mar. 31, 2015												11,216	11,229	(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	$ 699			694					694	5						$ 212		209				209	3
Net Income Attributable to Parent	694											271	271			209								137			137	110			110		$ 59			59	$ 95				$ 95
Other comprehensive (loss) income, net of tax	41				48	(12)	4		40	1		1		1		3			1	1	1	3						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	1		1						1
Common stock dividends	(570)			(570)					(570)
Distributions to parent												(600)	(600)
Distributions to noncontrolling interest in subsidiaries	(1)									(1)						(1)							(1)
Other																																						$ (1)	$ (1,384)	$ (2,450)	3,835
Balance at Mar. 31, 2016	$ 39,941	$ 1	$ 37,969	$ 2,688	$ (644)	$ (62)	$ 1	$ (61)	$ 39,892	$ 49						$ 13,067	$ 8,092	$ 5,040	$ (30)	$ 1	$ (16)	$ 13,087	$ (20)										$ 2,843	$ 762	$ 2,720	$ (639)
Balance, in shares at Mar. 31, 2016	689,000,000	689,000,000														100																	89,663,086
Ending member's equity at Mar. 31, 2016												$ 11,278	$ 11,288	$ (10)										$ 7,196			$ 7,196	$ 5,232			$ 5,231	$ 1					$ 3,930				$ 3,930

[1] The $13 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.