Condensed Consolidated Statements of Equity (Unaudited) (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] 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 Florida [Member] Pension And OPEB Related Adjustments To AOCI [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]
Balance at Dec. 31, 2011			$ 1												$ (2)																			$ 5,167	$ 762				$ 3,734	$ 1
Transfer of Vermillion Generating Station																																		28					26
Ending Member's Equity at Jan. 12, 2012
Balance at Dec. 31, 2011	22,865		1	21,132	1,873	(45)	(71)	(9)	(109)	22,772	93	9,454	9,473	(17)	(2)	10,025	7,418	16	2,752	(142)	(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	1,345											735	735			373									180		180		311		311			133			133		(109)			(109)
Net income	1,344	[1]			1,333					1,333	11					370			368			368	[2]	2
Other comprehensive income (loss), net of tax	(110)					(81)	(19)	9	(15)	(106)	(4)	2		2		99				99	0	99			71			71	26			26		1				1	(1)				(1)
Common stock issuances, including dividend reinvestment and employee benefits (in shares)	1,000,000
Common stock issuances, including dividend reinvestment and employee benefits	46			46						46						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
Common stock dividends	(1,211)				(1,211)					(1,211)						(369)			(369)			(369)
Dividends paid to parent												(250)	(250)												(310)		(310)		(170)		(170)
Preferred stock dividends at stated rates																									(2)		(2)		(1)		(1)
Changes in noncontrolling interest in subsidiaries	(4)	[3]									(4)
Transfer of Vermillion Generating Station																																		28		(28)			26		26
Deconsolidation of DS Cornerstone, LLC	(82)	[3]									(82)
Contribution from noncontrolling interest in DS Cornerstone, LLC	76	[3]									76
Distributions to noncontrolling interests	14															(2)								(2)
Recapitalization for merger with Duke Energy																0	(7,436)	7,436				0
Tax dividend																									0		0		(1)		(1)
Other																(1)								(1)
Notes To Reconciliation Of Total Equity [Details]
Net income attributable to preferred shareholders	1															3
Balance at Sep. 30, 2012	40,995		1	39,249	1,995	(126)	(90)		(124)	40,905	90	9,941	9,958	(15)	(2)	10,153	0	7,465	2,751	(43)	(23)	10,150		3	5,038	2,159	2,879	0	4,845	1,762	3,084	(1)		5,273	762	5,057	(519)	(27)	3,650	1	1,384	2,259	6
Balance (in shares) at Sep. 30, 2012	704,000,000
Beginning Member's Equity at Jun. 30, 2012
Net income	598											258				157									96				100					14					(19)
Other comprehensive income (loss), net of tax	(20)															98									72				26
Balance at Sep. 30, 2012	40,995		1									9,941			(2)	10,153									5,038				4,845					5,273	762				3,650	1
Balance (in shares) at Sep. 30, 2012	704,000,000
Balance at Dec. 31, 2012	40,941		1	39,279	1,889	(116)	(100)		(90)	40,863	78		9,888	(15)	(1)	10,185		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															100									160,000,000				100					89,663,086					53,913,701
Beginning Member's Equity at Dec. 31, 2012												9,872
Net income	1,984											767	767			479									362		362		250		250			96			96		276			276
Net income					1,977					1,977	7					479			477			477		2
Other comprehensive income (loss), net of tax	(78)					(133)	56	(2)	5	(74)	(4)	1		1		8				3	5	8			0				(1)				(1)	1				1	(2)				(2)
Common stock issuances, including dividend reinvestment and employee benefits (in shares)	2,000,000
Common stock issuances, including dividend reinvestment and employee benefits	38			38						38
Common stock dividends	(1,636)				(1,636)					(1,636)
Dividends paid to parent												(500)	(500)																(225)		(225)								(125)			(125)
Premium on the redemption of preferred stock of subsidiaries	(3)				(3)					(3)						(3)			(3)			(3)			(2)		(2)		(1)		(1)
Transfer of Vermillion Generating Station																																							0
Distributions to noncontrolling interests	(9)	[4]									(9)					(2)								(2)
Notes To Reconciliation Of Total Equity [Details]
Net income attributable to preferred shareholders																0
Balance at Sep. 30, 2013	41,237		1	39,317	2,227	(249)	(44)	(2)	(85)	41,165	72			(14)	(1)	10,667		7,465	3,257	(39)	(20)	10,663		4	5,487	2,159	3,328		4,822	1,762	3,061		(1)	5,263	762	4,882	(381)	0	3,857	1	1,384	2,469	3
Balance (in shares) at Sep. 30, 2013	706,000,000															100									160,000,000				100					89,663,086					53,913,701
Ending Member's Equity at Sep. 30, 2013												10,140	10,155
Beginning Member's Equity at Jun. 30, 2013
Net income	1,008											342				342									175				197					59					104
Other comprehensive income (loss), net of tax	(4)															4									0				(1)
Balance at Sep. 30, 2013	41,237		1												(1)	10,667		7,465							5,487	2,159			4,822	1,762				5,263	762	4,882			3,857	1	1,384
Balance (in shares) at Sep. 30, 2013	706,000,000															100									160,000,000				100					89,663,086					53,913,701
Ending Member's Equity at Sep. 30, 2013												$ 10,140

[1] For the nine months ended September 30, 2012 consolidated net income of $1,345 million includes $1 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 nine months ended September 30, 2012, consolidated net income of $373 million includes $3 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] Refer to Note 2 for further information related to DS Cornerstone, LLC.

[4] Includes payments to noncontrolling interests of $14 million for the nine months ended September 30, 2012.