Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2015

Public Utilities, General Disclosures [Line Items]



	December 31, 2014
			Duke				Duke		Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana
Regulatory Assets
Asset retirement obligations – coal ash	$	1,992	$	840	$	1,152	$	1,152	$	—	$	—	$	—
Asset retirement obligations – nuclear and other	1,025		67		730		432		298		—		—
Accrued pension and OPEB	2,015		412		812		354		458		132		217
Retired generation facilities	1,659		58		1,545		152		1,393		—		56
Debt fair value adjustment	1,305		—		—		—		—		—		—
Net regulatory asset related to income taxes	1,144		614		354		141		213		64		111
Hedge costs and other deferrals	628		103		490		217		273		7		28
DSM/EE	330		106		203		193		10		21		—
Grid Modernization	76		—		—		—		—		76		—
Vacation accrual	213		86		46		46		—		6		12
Deferred fuel and purchased power	246		50		182		138		44		9		5
Nuclear deferral	296		141		155		43		112		—		—
Post-in-service carrying costs and deferred operating expenses	494		124		121		28		93		21		228
Gasification services agreement buyout	55		—		—		—		—		—		55
Transmission expansion obligation	70		—		—		—		—		74		—
MGP	115		—		—		—		—		115		—
Other	494		263		109		66		42		36		66
Total regulatory assets	12,157		2,864		5,899		2,962		2,936		561		778
Less: current portion	1,115		399		491		287		203		49		93
Total noncurrent regulatory assets	$	11,042	$	2,465	$	5,408	$	2,675	$	2,733	$	512	$	685

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



	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
Asset retirement obligations – coal ash	$	2,555	$	1,120	$	1,394	$	1,386	$	8	$	4	$	37
Asset retirement obligations – 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
Demand side management (DSM)/Energy efficiency (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		—
Manufactured gas plant (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

Schedule Of Regulatory Liabilities



	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



	December 31, 2014
			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	$	5,221	$	2,420	$	1,975	$	1,692	$	283	$	222	$	613
Amounts to be refunded to customers	166		—		70		—		70		—		96
Storm reserve	150		25		125		—		125		—		—
Accrued pension and OPEB	379		76		121		61		60		19		91
Deferred fuel and purchased power	37		6		23		23		—		—		8
Other	444		217		171		127		44		10		42
Total regulatory liabilities	6,397		2,744		2,485		1,903		582		251		850
Less: current portion	204		34		106		71		35		10		54
Total noncurrent regulatory liabilities	$	6,193	$	2,710	$	2,379	$	1,832	$	547	$	241	$	796

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.



	December 31, 2015
			Duke		Duke
	Duke		Energy		Energy
	Energy		Florida_(b)		Indiana_(c)
Capacity (in MW)	1,821		873		948
Remaining net book value (in millions)^(a)	$	352	$	131	$	221


(a)	Remaining net book value amounts presented exclude any capitalized asset retirement costs related to closure of ash basins.


(b)	Includes Crystal River Units 1 and 2. Progress Energy amounts are equal to Duke Energy Florida amounts.

(c)

Includes Wabash River Units 2 through 6 and Gallagher Units 2 and 4. Wabash River Unit 6 is being evaluated for potential conversion to natural gas. Duke Energy Indiana committed to retire or convert the Wabash River Units 2 through 6 by June 2018 in conjunction with a settlement agreement associated with the Edwardsport air permit. 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 proposed 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 obligations related to its withdrawal from MISO. As of December 31, 2015, $72 million is recorded as a Regulatory asset on Duke Energy Ohio's Consolidated Balance Sheets.



			Provisions/		Cash
(in millions)	December 31, 2014		Adjustments		Reductions			December 31, 2015
Duke Energy Ohio	$	94	$	3	$	(5	)	$	92