Commitments and Contingencies (Table)

12 Months Ended

Dec. 31, 2016

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	$	69
Duke Energy Carolinas	22
Duke Energy Ohio	36
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)	2016		2015
Reserves for Legal Matters
Duke Energy	$	98	$	156
Duke Energy Carolinas	23		11
Progress Energy	59		54
Duke Energy Progress	14		6
Duke Energy Florida	28		31
Duke Energy Ohio	4		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, 2016
	Contract
(in millions)	Expiration	2017		2018		2019		2020		2021		Thereafter		Total
Duke Energy Progress(a)	2019-2031	$	66	$	67	$	67	$	50	$	51	$	267	$	568
Duke Energy Florida(b)	2021-2043	341		357		377		394		376		1,211		3,056
Duke Energy Ohio(c)(d)	2018	203		89		—		—		—		—		292

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

(b)     Contracts represent between 81 percent and 100 percent of net plant output.

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

(d)    Excludes PPA with OVEC. See Note 17 for additional information.

Schedule of Natural Gas Supply Contract Commitments [Table Text Block]

The following table presents future unconditional purchase obligations under natural gas supply and capacity contracts as of December 31, 2016.

(in millions)	Duke Energy		Duke Energy Ohio
2017	$	371	$	52
2018	308		35
2019	286		26
2020	269		22
2021	267		22
Thereafter	1,595		7
Total	$	3,096	$	164

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)	2016		2015		2014
Duke Energy	$	242	$	313	$	350
Duke Energy Carolinas	45		41		41
Progress Energy	140		230		257
Duke Energy Progress	68		149		161
Duke Energy Florida	72		81		96
Duke Energy Ohio	16		13		17
Duke Energy Indiana	23		20		21

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, 2016
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana
2017	$	218	$	41	$	129	$	75	$	54	$	12	$	20
2018	205		35		126		73		53		11		17
2019	181		27		120		68		52		7		11
2020	164		23		109		58		51		6		10
2021	134		17		91		43		48		4		6
Thereafter	948		52		602		379		223		7		9
Total	$	1,850	$	195	$	1,177	$	696	$	481	$	47	$	73

Schedule of Future Minimum Lease Payments for Capital Leases

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

	December 31, 2016
				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana
2017	$	148		$	6		$	46		$	21		$	25		$	4		$	1
2018	154			6			46			21			25			3			2
2019	154			6			45			20			25			1			1
2020	159			5			46			22			25			—			1
2021	163			1			45			20			25			—			1
Thereafter	784			30			322			250			71			—			41
Minimum annual payments	1,562			54			550			354			196			8			47
Less: amount representing interest	(462		)	(32		)	(265		)	(212		)	(53		)	(1		)	(36		)
Total	$	1,100		$	22		$	285		$	142		$	143		$	7		$	11

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, 2013	$	74		$	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	92			10			17			5			12			54			10
Provisions/adjustments	11			1			4			—			4			1			5
Cash reductions	(9		)	(1		)	(4		)	(2		)	(2		)	(1		)	(3		)
Balance at December 31, 2015	94			10			17			3			14			54			12
Provisions/adjustments	19			4			7			2			4			7			1
Cash reductions	(15		)	(4		)	(6		)	(2		)	(4		)	(2		)	(3		)
Balance at December 31, 2016	$	98		$	10		$	18		$	3		$	14		$	59		$	10