Commitments and Contingencies (Table)

12 Months Ended

Dec. 31, 2015

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Additional Possible Losses in Excess of Recorded Environmental Reserves

Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are not material except as presented in the table below.

(in millions)
Duke Energy	$	74
Duke Energy Carolinas	22
Duke Energy Ohio	42
Duke Energy Indiana	7

Schedule of Legal Reserves

The table below presents recorded reserves based on management’s best estimate of probable loss for legal matters, excluding asbestos-related reserves and the exit obligation discussed above related to the termination of an EPC contract. Reserves are classified on the Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Accounts payable and Other within Current Liabilities. The reasonably possible range of loss in excess of recorded reserves is not material, other than as described above.

	December 31,
(in millions)	2015		2014
Reserves for Legal Matters
Duke Energy	$	166	$	323
Duke Energy Carolinas	11		72
Progress Energy	54		93
Duke Energy Progress	6		37
Duke Energy Florida	31		36
Duke Energy Ohio	80		—

Schedule of Purchase Power Obligations

The following table presents executory purchased power contracts with terms exceeding one year, excluding contracts classified as leases.

		Minimum Purchase Amount at December 31, 2015
	Contract
(in millions)	Expiration	2016		2017		2018		2019		2020		Thereafter		Total
Duke Energy Progress(a)	2019-2031	$	54	$	60	$	61	$	62	$	49	$	363	$	649
Duke Energy Florida(b)	2021-2043	305		345		360		377		394		1,591		3,372
Duke Energy Ohio(c)(d)	2017-2018	236		195		59		—		—		—		490

(a)    Contracts represent between 15 percent and 100 percent of net plant output.

(b)     Contracts represent between 80 percent and 100 percent of net plant output.

(c)    Contracts represent between 1 percent and 11 percent of net plant output.

(d)    Excludes purchase power agreement with OVEC. See Note 17 for additional information.

Schedule of Operating Lease Rent Expense

The following table presents rental expense for operating leases. These amounts are included in Operation, maintenance and other on the Consolidated Statements of Operations.

	Years Ended December 31,
(in millions)	2015		2014		2013
Duke Energy	$	318	$	355	$	321
Duke Energy Carolinas	41		41		39
Progress Energy	230		257		225
Duke Energy Progress	149		161		153
Duke Energy Florida	81		96		72
Duke Energy Ohio	13		17		14
Duke Energy Indiana	20		21		22

Schedule of Future Minimum Rental Payments for Operating Leases

The following table presents future minimum lease payments under operating leases, which at inception had a non-cancelable term of more than one year.

	December 31, 2015
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana
2016	$	219	$	41	$	132	$	66	$	66	$	13	$	20
2017	182		33		111		63		48		9		15
2018	161		24		108		61		47		6		12
2019	146		21		102		56		46		4		8
2020	127		16		93		48		45		3		5
Thereafter	864		51		622		365		257		5		8
Total	$	1,699	$	186	$	1,168	$	659	$	509	$	40	$	68

Schedule of Future Minimum Lease Payments for Capital Leases

The following table presents future minimum lease payments under capital leases.

	December 31, 2015
				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana
2016	$	173		$	6		$	46		$	20		$	26		$	7		$	3
2017	171			6			46			21			25			1			1
2018	180			6			46			21			25			5			2
2019	178			6			45			22			25			1			1
2020	182			5			46			21			25			—			1
Thereafter	1,176			30			367			272			95			1			43
Minimum annual payments	2,060			59			596			377			221			15			51
Less: amount representing interest	(724		)	(35		)	(295		)	(230		)	(65		)	(2		)	(38		)
Total	$	1,336		$	24		$	301		$	147		$	156		$	13		$	13

Reserve for Environmental Costs [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Legal Reserves

The following tables contain information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Other within Deferred Credits and Other Liabilities on the Consolidated Balance Sheets.

				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana
Balance at December 31, 2012	$	75		$	12		$	33		$	14		$	19		$	15		$	8
Provisions/adjustments	26			—			4			(1		)	5			20			1
Cash reductions	(22		)	(1		)	(10		)	(5		)	(5		)	(8		)	(2		)
Balance at December 31, 2013	79			11			27			8			19			27			7
Provisions/adjustments	32			(1		)	1			4			(3		)	28			4
Cash reductions	(14		)	—			(11		)	(7		)	(4		)	(1		)	(1		)
Balance at December 31, 2014	97			10			17			5			12			54			10
Provisions/adjustments	9			1			4			—			4			1			5
Cash reductions	(9		)	(1		)	(4		)	(2		)	(2		)	(1		)	(3		)
Balance at December 31, 2015	$	97		$	10		$	17		$	3		$	14		$	54		$	12