Consolidated Statements of Equity (USD $) In Millions, except Share data	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Foreign Currency Adjustments [Member]	Net Gains (Losses) on Cash Flow Hedges [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] 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 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, 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)	(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
Net income	634									244	244			154							110		110	110		110		(21)			(21)		90			90
Net income	634			634				634						154		153			153	1
Other comprehensive income (loss), net of tax	17				4	10	3	17		0		0		2			1	1	2									1				1	0				0
Common stock issuances, including dividend reinvestment and employee benefits (in shares)	2,000,000
Common stock issuances, including dividend reinvestment and employee benefits	(16)		(16)					(16)
Common stock dividends	(542)			(542)				(542)
Dividends to parent										0	0
Premium on the redemption of preferred stock of subsidiaries	(3)			(3)				(3)						(3)		(3)			(3)		(2)		(2)	(1)		(1)
Changes in noncontrolling interest in subsidiaries	(1)								(1)
Distributions to noncontrolling interests														(3)						(3)
Total Member's Equity										10,116	10,132	(15)	(1)
Balance at Mar. 31, 2013	41,030	1	39,263	1,978	(112)	(90)	(87)	40,953	77					10,335	7,465	2,933	(41)	(24)	10,333	2	5,235	2,159	3,076	4,908	1,762	3,146		5,146	762	4,882	(498)	0	3,798	1	1,384	2,408	5
Balance, in shares at Mar. 31, 2013	706,000,000
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	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													100							160,000,000			100				89,663,086					53,913,701
Net income	(93)									286	286			203							133		133	108		108		(890)			(890)		113			113
Net income				(97)				(97)	4					203		202			202	1
Other comprehensive income (loss), net of tax	23				23		(1)	22	1	1		1		2			1	1	2					1			1	0					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	7		7					7
Common stock dividends	(553)			(553)				(553)
Dividends to parent										(126)	(126)													(124)		(124)		(100)		(100)						0
Distributions to noncontrolling interests	(3)								(3)					(3)						(3)
Transfer of service company net assets to Duke Energy														(539)		(542)	3		(539)
Total Member's Equity										10,511	10,525	(13)	(1)
Balance at Mar. 31, 2014	$ 40,789	$ 1	$ 39,372	$ 1,713	$ (284)	$ (40)	$ (53)	$ 40,709	$ 80					$ 10,527	$ 7,467	$ 3,112	$ (39)	$ (15)	$ 10,525	$ 2	$ 5,758	$ 2,159	$ 3,599	$ 4,782	$ 1,762	$ 3,020	$ 0	$ 4,279	$ 762	$ 4,782	$ (1,265)	$ 0	$ 4,053	$ 1	$ 1,384	$ 2,664	$ 4
Balance, in shares at Mar. 31, 2014	707,000,000													100							160,000,000			100				89,663,086					53,913,701