Consolidated Statements of 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 To AOCI [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] Net Gains (Losses) on Available for Sale Securities [Member]	Progress Energy [Member] Pension And OPEB Related Adjustments To AOCI [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] Net Gains (Losses) on Cash Flow Hedges [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 To AOCI [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, 2011																$ 9,454	$ 9,473	$ (17)	$ (2)
Balance at Dec. 31, 2011		22,865		1	21,132	1,873		(45)	(71)	(9)	(109)	22,772		93						10,025	7,418	16	2,752	(142)	0	(23)	10,021	4	5,088	2,148	3,011	(71)	4,675	1,757	2,945	(27)	5,167	762	5,085	(652)	(28)	3,734	1	1,358	2,368	7
Balance (in shares) at Dec. 31, 2011		445,000,000
Net Income (Loss) Attributable to Parent		1,768														865	865			400																	175					(50)			(50)
Net income		1,782				1,768	[1]					1,768	[1]	12	[1]					407									272		272		266		266		175			175
Net income (loss) available to common stockholders		1,780	[1]																										269				264
Net Income Loss Including Portion Attributable To Noncontrolling Interest Equity Statement	[2]																			403			400				400	3
Other comprehensive income (loss), net of tax		(76)						(71)	(29)	9	19	(72)		(4)		3		2	1	98				100		(2)	98		71			71	27			27	27				27	(2)				(2)
Distribution to parent																(450)	(450)
Common stock issuances, including dividend reinvestment and employee benefits (in shares)		1,000,000
Common stock issuances, including dividend reinvestment and employee benefits		76			76							76								31	18	13					31
Common stock issued in connection with the Progress Energy Merger (in shares)		258,000,000
Common stock issued in connection with the Progress Energy Merger		18,071			18,071							18,071
Stock-based compensation expense																													11	11			5	5
Transfer of Vermillion Generating Station																																					(28)		(28)			(26)		(26)
Common stock dividends		(1,752)				(1,752)						(1,752)								(369)			(369)				(369)		(310)		(310)		(170)		(170)		(175)		(175)
Preferred stock dividends at stated rates																													(3)		(3)		(2)		(2)
Contributions from noncontrolling Interests		76
Deconsolidation of DS Cornerstone, LLC		(82)												(82)
Contribution from noncontrolling interest in DS Cornerstone, LLC		76												76
Changes in noncontrolling interest in subsidiaries		(17)	[3]											(17)	[3]					(2)								(2)
Recapitalization for merger with Duke Energy																					(7,436)	7,436
Tax dividend																													(2)		(2)		(2)		(2)
Noncontrolling Interest Other Transactions																				(1)								(1)
Total Member's Equity																9,872	9,888	(15)	(1)
Notes To Reconciliation Of Total Equity [Details]
Net income attributable to preferred shareholders																				4
Balance at Dec. 31, 2012		40,941		1	39,279	1,889		(116)	(100)	0	(90)	40,863		78						10,185	0	7,465	2,783	(42)	0	(25)	10,181	4	5,127	2,159	2,968	0	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
Beginning Member's Equity at Dec. 31, 2012																9,872
Net Income (Loss) Attributable to Parent		634																		153
Net income		634														244				154									110				110				(21)					90
Balance at Mar. 31, 2013
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		7,465	2,783	(42)	0	(25)	10,181	4	5,127		2,968		4,799		3,037	0	5,166	762		(477)	(1)	3,708	1		2,318	5
Balance (in shares) at Dec. 31, 2012				704,000,000
Net Income (Loss) Attributable to Parent		2,665														976	976			672																	102					358			358
Net income		2,676				2,665						2,665		11		976				675									500		500		325		325		102			102		358
Net income (loss) available to common stockholders		2,676																											500				325
Net Income Loss Including Portion Attributable To Noncontrolling Interest Equity Statement																				675			672				672	3
Other comprehensive income (loss), net of tax		(99)						(191)	60		38	(93)		(6)		1		1	0	8				(1)		9	8		0				(1)			(1)	1				1	(2)				(2)
Distribution to parent																(499)	(499)
Common stock issuances, including dividend reinvestment and employee benefits (in shares)		2,000,000
Common stock issuances, including dividend reinvestment and employee benefits		86			86							86
Common stock dividends		(2,188)				(2,188)						(2,188)																					(325)		(325)							(125)			(125)
Premium on the redemption of preferred stock of subsidiaries		(3)				(3)						(3)								(3)			(3)				(3)		(2)		(2)		(1)		(1)
Contributions from noncontrolling Interests		9												9
Changes in noncontrolling interest in subsidiaries		(14)	[3]											(14)	[3]					(3)								(3)
Other additional paid in capital adjustments																				2		2					2
Noncontrolling Interest Other Transactions																												0
Total Member's Equity																10,350	10,365	(14)	(1)
Notes To Reconciliation Of Total Equity [Details]
Net income attributable to preferred shareholders		2
Balance at Dec. 31, 2013		41,408			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	0	4,797	1,762	3,036	(1)	5,269	762		(375)	0	3,939	1	1,384	2,551	3
Balance (in shares) at Dec. 31, 2013		706,000,000																		100									160,000,000				100				89,663,086					53,913,701
Beginning Member's Equity at Sep. 30, 2013
Net Income (Loss) Attributable to Parent		688																		195
Net income		692														209				196									138				75				6					82
Total Member's Equity																10,350
Balance at Dec. 31, 2013		41,408																		10,864	0								5,625	2,159		0	4,797	1,762			5,269	762				3,939	1	1,384
Balance (in shares) at Dec. 31, 2013		706,000,000																		100									160,000,000				100				89,663,086					53,913,701
Beginning Member's Equity at Dec. 31, 2013																10,350
Net Income (Loss) Attributable to Parent		(97)																		202
Net income		(93)														286				203									133				108				(890)					113
Balance at Mar. 31, 2014
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		3,452	(43)	0	(16)	10,860	4	5,625	2,159	3,466	0	4,797	1,762	3,036	(1)	5,269	762	4,882	(375)		3,939	1	1,384	2,551
Balance (in shares) at Dec. 31, 2013		706,000,000		706,000,000																100									160,000,000				100				89,663,086					53,913,701
Net Income (Loss) Attributable to Parent		1,883														1,072	1,072			869																	(495)					359			359
Net income		1,889				1,883						1,883		6		1,072				874									467		467		548		548		(495)			(495)		359
Net income (loss) available to common stockholders																													467				548
Net Income Loss Including Portion Attributable To Noncontrolling Interest Equity Statement																				874			869				869	5
Other comprehensive income (loss), net of tax		(136)						(132)	(19)	3	4	(144)		8		2		2	0	18				8	1	9	18		0				1			1
Distribution to parent																(500)	(500)
Common stock issuances, including dividend reinvestment and employee benefits (in shares)				1,000,000
Common stock issuances, including dividend reinvestment and employee benefits		40			40							40
Common stock dividends		(2,234)				(2,234)						(2,234)																	(225)		(225)		(124)		(124)		(100)		(100)			(450)			(450)
Changes in noncontrolling interest in subsidiaries		(65)	[3]											(65)	[3]					(37)								(37)
Other additional paid in capital adjustments		(3)
Stockholders' Equity, Other																				(539)			(539)				(539)
Noncontrolling Interest Other Transactions														(3)						(4)								(4)
Total Member's Equity																10,924	10,937	(12)	(1)
Balance at Dec. 31, 2014		40,899		1	39,405	2,012		(439)	(59)	3	(48)	40,875		24						11,176	0	7,467	3,782	(35)	1	(7)	11,208	(32)	5,867	2,159	3,708	0	5,222	1,762	3,460	0	4,674	762	4,782	(870)	0	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 Sep. 30, 2014
Net Income (Loss) Attributable to Parent		97																		136
Net income		100														139				139									76				93				64					58
Total Member's Equity																10,924
Balance at Dec. 31, 2014		$ 40,899																		$ 11,176	$ 0	$ 7,467							$ 5,867	$ 2,159		$ 0	$ 5,222	$ 1,762			$ 4,674	$ 762			$ 0	$ 3,848	$ 1	$ 1,384		$ 3
Balance (in shares) at Dec. 31, 2014		707,000,000																		100									160,000,000				100				89,663,086					53,913,701

[1] For the year ended December 31, 2012, consolidated net income of $1,782 million includes $2 million attributable to preferred shareholders of subsidiaries. Income attributable to preferred shareholders of subsidiaries is not a component of total equity and is excluded from the table above.

[2] For the year ended December 31, 2012, consolidated net income of $407 million included $4 million attributable to preferred shareholders of subsidiaries. Income attributable to preferred shareholders of subsidiaries is not a component of total equity and is excluded from the table above.

[3] This decrease primarily relates to cash distributions to noncontrolling interests