Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2016

Public Utilities, General Disclosures [Line Items]

Schedule of Regulatory Assets

	December 31, 2015
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana
Regulatory Assets
AROs – coal ash	$	2,555	$	1,120	$	1,394	$	1,386	$	8	$	4	$	37
AROs – nuclear and other	838		104		487		195		292		—		—
Accrued pension and OPEB	2,151		479		807		366		441		139		220
Retired generation facilities	509		49		409		179		230		—		51
Debt fair value adjustment	1,191		—		—		—		—		—		—
Net regulatory asset related to income taxes	1,075		564		318		106		212		55		120
Nuclear asset securitizable balance, net	1,237		—		1,237		—		1,237		—		—
Hedge costs and other deferrals	571		127		410		171		239		7		27
DSM/EE	340		80		250		237		13		10		—
Grid Modernization	68		—		—		—		—		68		—
Vacation accrual	192		79		38		38		—		5		10
Deferred fuel and purchased power	151		21		129		93		36		1		—
Nuclear deferral	245		107		138		62		76		—		—
Post-in-service carrying costs and deferred operating expenses	383		97		38		38		—		21		227
Gasification services agreement buyout	32		—		—		—		—		—		32
Transmission expansion obligation	72		—		—		—		—		72		—
MGP	104		—		—		—		—		104		—
NCEMPA deferrals	21		—		21		21		—		—		—
East Bend deferrals	16		—		—		—		—		16		—
Other	499		244		121		82		39		31		94
Total regulatory assets	12,250		3,071		5,797		2,974		2,823		533		818
Less: current portion	877		305		362		264		98		36		102
Total noncurrent regulatory assets	$	11,373	$	2,766	$	5,435	$	2,710	$	2,725	$	497	$	716

The following tables present the regulatory assets and liabilities recorded on the Consolidated Balance Sheets.

	December 31, 2016
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana
Regulatory Assets
AROs – coal ash	$	3,761	$	1,536	$	1,830	$	1,822	$	8	$	12	$	276
AROs – nuclear and other	684		9		569		275		294		—		—
Accrued pension and OPEB	2,387		481		882		423		458		135		222
Retired generation facilities	534		39		422		165		257		—		73
Debt fair value adjustment	1,313		—		—		—		—		—		—
Net regulatory asset related to income taxes	894		484		231		7		224		63		119
Storm cost deferrals	153		—		148		148		—		5		—
Nuclear asset securitized balance, net	1,193		—		1,193		—		1,193		—		—
Hedge costs and other deferrals	217		93		91		66		25		7		26
Derivatives – gas supply contracts	187		—		—		—		—		—		—
Demand side management (DSM)/Energy efficiency (EE)	407		122		278		263		15		6		—
Grid Modernization	65		—		—		—		—		65		—
Vacation accrual	196		76		38		38		—		4		10
Deferred fuel and purchased power	156		—		111		24		87		5		40
Nuclear deferral	226		92		134		38		96		—		—
Post-in-service carrying costs and deferred operating expenses	413		70		42		42		—		20		281
Gasification services agreement buyout	8		—		—		—		—		—		8
Transmission expansion obligation	71		—		—		—		—		71		—
Manufactured gas plant (MGP)	99		—		—		—		—		99		—
Advanced metering infrastructure	218		172		—		—		—		—		46
NCEMPA deferrals	51		—		51		51		—		—		—
East Bend deferrals	32		—		—		—		—		32		—
Other	636		223		103		69		36		33		121
Total regulatory assets	13,901		3,397		6,123		3,431		2,693		557		1,222
Less: current portion	1,023		238		401		188		213		37		149
Total noncurrent regulatory assets	$	12,878	$	3,159	$	5,722	$	3,243	$	2,480	$	520	$	1,073

Schedule Of Regulatory Liabilities

	December 31, 2016
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana
Regulatory Liabilities
Costs of removal	$	6,074	$	2,476	$	2,198	$	1,840	$	358	$	212	$	660
Amounts to be refunded to customers	45		—		—		—		—		—		45
Storm reserve	83		22		60		—		60		1		—
Accrued pension and OPEB	174		46		—		—		—		19		72
Deferred fuel and purchased power	192		105		81		64		17		6		—
Other	722		352		245		200		44		19		11
Total regulatory liabilities	7,290		3,001		2,584		2,104		479		257		788
Less: current portion	409		161		189		158		31		21		40
Total noncurrent regulatory liabilities	$	6,881	$	2,840	$	2,395	$	1,946	$	448	$	236	$	748

	December 31, 2015
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana
Regulatory Liabilities
Costs of removal	$	5,329	$	2,413	$	2,078	$	1,725	$	353	$	222	$	616
Amounts to be refunded to customers	71		—		—		—		—		—		71
Storm reserve	150		24		125		—		125		1		—
Accrued pension and OPEB	288		68		51		25		26		21		83
Deferred fuel and purchased power	311		55		255		58		197		1		—
Other	506		281		164		155		8		12		46
Total regulatory liabilities	6,655		2,841		2,673		1,963		709		257		816
Less: current portion	400		39		286		85		200		12		62
Total noncurrent regulatory liabilities	$	6,255	$	2,802	$	2,387	$	1,878	$	509	$	245	$	754

Schedule of Potential Plant Retirements

The table below contains the net carrying value of generating facilities planned for retirement or included in recent IRPs as evaluated for potential retirement due to a lack of requisite environmental control equipment. Dollar amounts in the table below are included in Net property, plant and equipment on the Consolidated Balance Sheets as of December 31, 2016 and exclude capitalized asset retirement costs.

		Remaining Net
	Capacity	Book Value
	(in MW)	(in millions)
Duke Energy Carolinas
Allen Steam Station Units 1-3(a)	585	$	168
Progress Energy and Duke Energy Florida
Crystal River Units 1 and 2	873	120
Duke Energy Indiana(b)
Gallagher Units 2 and 4(c)	280	136
Total Duke Energy	1,738	$	424

(a) Duke Energy Carolinas will retire Allen Steam Station Units 1 through 3 by December 31, 2024, as part of the resolution of a lawsuit involving alleged New Source Review violations.

(b) Duke Energy Indiana retired Wabash River Units 2 through 6 in 2016.

(c) Duke Energy Indiana committed to either retire or stop burning coal at Gallagher Units 2 and 4 by December 31, 2022, as part of the settlement of Edwardsport IGCC matters.

Duke Energy Ohio [Member]

Public Utilities, General Disclosures [Line Items]

Schedule of MISO Exit Fee Obligations

The following table provides a reconciliation of the beginning and ending balance of Duke Energy Ohio’s recorded liability for its exit obligation and share of MTEP costs, excluding MVP, recorded within Other in Current liabilities and Other in Deferred credits and other liabilities on the Consolidated Balance Sheets. The retail portions of MTEP costs billed by MISO are recovered by Duke Energy Ohio through a non-bypassable rider. As of December 31, 2016 and 2015, $71 million and $72 million are recorded in Regulatory assets on Duke Energy Ohio's Consolidated Balance Sheets, respectively.

			Provisions/		Cash
(in millions)	December 31, 2015		Adjustments		Reductions			December 31, 2016
Duke Energy Ohio	$	92	$	3	$	(5	)	$	90