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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. Derivative amounts in the table below exclude cash collateral which is disclosed in Note 14. See Note 15 for additional information related to investments by major security type.



	December 31, 2016
(in millions)	Total Fair Value			Level 1			Level 2			Level 3			Not Categorized
Nuclear decommissioning trust fund equity securities	$	4,106		$	4,029		$	—		$	—		$	77
Nuclear decommissioning trust fund debt securities	2,078			632			1,446			—			—
Other trading and available-for-sale equity securities	104			104			—			—			—
Other trading and available-for-sale debt securities	266			75			186			5			—
Derivative assets	162			5			136			21			—
Total assets	6,716			4,845			1,768			26			77
Derivative liabilities	(252		)	(2		)	(63		)	(187		)	—
Net assets (liabilities)	$	6,464		$	4,843		$	1,705		$	(161	)	$	77



	December 31, 2015
(in millions)	Total Fair Value			Level 1		Level 2			Level 3		Not Categorized
Nuclear decommissioning trust fund equity securities	$	3,590		$	3,418	$	—		$	—	$	172
Nuclear decommissioning trust fund debt securities	2,227			672		1,555			—		—
Other available-for-sale equity securities	95			95		—			—		—
Other available-for-sale debt securities	302			75		222			5		—
Derivative assets	25			—		15			10		—
Total assets	6,239			4,260		1,792			15		172
Derivative liabilities	(397		)	—		(397		)	—		—
Net assets	$	5,842		$	4,260	$	1,395		$	15	$	172

Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs

The following tables provide reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements. Amounts included in earnings for derivatives are primarily included in Operating Revenues.



	December 31, 2016
			Derivatives
(in millions)	Investments		(net)			Total
Balance at beginning of period	$	5	$	10		$	15
Derivative liability resulting from the acquisition of Piedmont	—		(187		)	(187		)
Purchases, sales, issuances and settlements:
Purchases	—		33			33
Settlements	—		(28		)	(28		)
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities	—		6			6
Balance at end of period	$	5	$	(166	)	$	(161	)



	December 31, 2015
			Derivatives
(in millions)	Investments		(net)			Total
Balance at beginning of period	$	5	$	(1	)	$	4
Total pretax realized or unrealized gains (losses) included in earnings	—		21			21
Purchases, sales, issuances and settlements:
Purchases	—		24			24
Sales	—		(1		)	(1		)
Settlements	—		(37		)	(37		)
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities	—		4			4
Balance at end of period	$	5	$	10		$	15

Quantitative Information Table - Level 3

The following table includes quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.



	December 31, 2016
	Fair Value
Investment Type	(in millions)			Valuation Technique	Unobservable Input	Range
Duke Energy
Natural gas contracts	$	(187	)	Discounted cash flow	Forward natural gas curves - price per million British thermal unit (MMBtu)	$	2.31		-	$	4.18
Financial Transmission Rights (FTRs)	21			RTO auction pricing	FTR price – per megawatt-hour (MWh)	(0.83		)	-	9.32
Total Level 3 derivatives	$	(166	)
Duke Energy Ohio	$	5		RTO auction pricing	FTR price – per MWh	$	0.77		-	$	3.52
Duke Energy Indiana	16			RTO auction pricing	FTR price – per MWh	(0.83		)	-	9.32



	December 31, 2015
	Fair Value
Investment Type	(in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy	$	10	RTO auction pricing	FTR price – per MWh	$	(0.74	)	-	$	7.29
Duke Energy Ohio	3		RTO auction pricing	FTR price – per MWh	0.67			-	2.53
Duke Energy Indiana	7		RTO auction pricing	FTR price – per MWh	(0.74		)	-	7.29

Schedule of Long-term debt, including current

The fair value and book value of long-term debt, including current maturities, is summarized in the following table. Estimates determined are not necessarily indicative of amounts that could have been settled in current markets. Fair value of long-term debt uses Level 2 measurements.



	December 31, 2016				December 31, 2015
(in millions)	Book Value		Fair Value		Book Value		Fair Value
Duke Energy	$	47,895	$	49,161	$	38,868	$	41,767
Duke Energy Carolinas	9,603		10,494		8,367		9,156
Progress Energy	17,541		19,107		14,464		15,856
Duke Energy Progress	7,011		7,357		6,518		6,757
Duke Energy Florida	6,125		6,728		4,266		4,908
Duke Energy Ohio	1,884		2,020		1,598		1,724
Duke Energy Indiana	3,786		4,260		3,768		4,219

Duke Energy Carolinas [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 14. See Note 15 for additional information related to investments by major security type.



	December 31, 2016
(in millions)	Total Fair Value			Level 1		Level 2			Level 3		Not Categorized
Nuclear decommissioning trust fund equity securities	$	2,245		$	2,168	$	—		$	—	$	77
Nuclear decommissioning trust fund debt securities	1,013			178		835			—		—
Other available-for-sale debt securities	3			—		—			3		—
Derivative assets	33			—		33			—		—
Total assets	3,294			2,346		868			3		77
Derivative liabilities	(16		)	—		(16		)	—		—
Net assets	$	3,278		$	2,346	$	852		$	3	$	77



	December 31, 2015
(in millions)	Total Fair Value			Level 1		Level 2			Level 3		Not Categorized
Nuclear decommissioning trust fund equity securities	$	2,094		$	1,922	$	—		$	—	$	172
Nuclear decommissioning trust fund debt securities	944			246		698			—		—
Other available-for-sale debt securities	3			—		—			3		—
Total assets	3,041			2,168		698			3		172
Derivative liabilities	(45		)	—		(45		)	—		—
Net assets	$	2,996		$	2,168	$	653		$	3	$	172

Progress Energy [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 14. See Note 15 for additional information related to investments by major security type.



	December 31, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	1,861		$	1,861	$	—
Nuclear decommissioning trust fund debt securities	1,065			454		611
Other available-for-sale debt securities	65			21		44
Derivative assets	85			—		85
Total assets	3,076			2,336		740
Derivative liabilities	(25		)	—		(25		)
Net assets	$	3,051		$	2,336	$	715



	December 31, 2015
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	1,496		$	1,496	$	—
Nuclear decommissioning trust fund debt securities	1,283			426		857
Other available-for-sale debt securities	63			18		45
Derivative assets	11			—		11
Total assets	2,853			1,940		913
Derivative liabilities	(322		)	—		(322		)
Net assets	$	2,531		$	1,940	$	591

Duke Energy Progress [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities



	December 31, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	1,505		$	1,505	$	—
Nuclear decommissioning trust fund debt securities and other	708			207		501
Other available-for-sale debt securities and other	1			1		—
Derivative assets	46			—		46
Total assets	2,260			1,713		547
Derivative liabilities	(7		)	—		(7		)
Net assets	$	2,253		$	1,713	$	540



	December 31, 2015
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	1,178		$	1,178	$	—
Nuclear decommissioning trust fund debt securities and other	860			141		719
Other available-for-sale debt securities and other	1			1		—
Derivative assets	2			—		2
Total assets	2,041			1,320		721
Derivative liabilities	(98		)	—		(98		)
Net assets	$	1,943		$	1,320	$	623

Duke Energy Florida [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities



	December 31, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	356		$	356	$	—
Nuclear decommissioning trust fund debt securities and other	357			247		110
Other available-for-sale debt securities and other	48			4		44
Derivative assets	39			—		39
Total assets	800			607		193
Derivative liabilities	(12		)	—		(12		)
Net assets	$	788		$	607	$	181



	December 31, 2015
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	318		$	318	$	—
Nuclear decommissioning trust fund debt securities and other	423			285		138
Other available-for-sale debt securities and other	51			6		45
Derivative assets	7			—		7
Total assets	799			609		190
Derivative liabilities	(216		)	—		(216		)
Net assets (liabilities)	$	583		$	609	$	(26	)

Duke Energy Ohio [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities



	December 31, 2016
(in millions)	Total Fair Value			Level 1		Level 2			Level 3
Derivative assets	$	5		$	—	$	—		$	5
Derivative liabilities	(6		)	—		(6		)	—
Net (liabilities) assets	$	(1	)	$	—	$	(6	)	$	5



	December 31, 2015
(in millions)	Total Fair Value			Level 1		Level 2			Level 3
Derivative assets	$	3		$	—	$	—		$	3
Derivative liabilities	(7		)	—		(7		)	—
Net (liabilities) assets	$	(4	)	$	—	$	(7	)	$	3

Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs

The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.



	Derivatives (net)
	Years Ended December 31,
(in millions)	2016			2015
Balance at beginning of period	$	3		$	(18	)
Total pretax realized or unrealized gains (losses) included in earnings	—			21
Purchases, sales, issuances and settlements:
Purchases	5			5
Settlements	(5		)	(5		)
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities	2			—
Balance at end of period	$	5		$	3

Duke Energy Indiana [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 14. See Note 15 for additional information related to investments by major security type.



	December 31, 2016
(in millions)	Total Fair Value			Level 1			Level 2		Level 3
Other available-for-sale equity securities	$	79		$	79		$	—	$	—
Other available-for-sale debt securities and other	31			—			31		—
Derivative assets	16			—			—		16
Total assets	126			79			31		16
Derivative liabilities	(2		)	(2		)	—		—
Net assets	$	124		$	77		$	31	$	16



	December 31, 2015
(in millions)	Total Fair Value		Level 1		Level 2		Level 3
Other available-for-sale equity securities	$	71	$	71	$	—	$	—
Other available-for-sale debt securities and other	30		2		28		—
Derivative assets	7		—		—		7
Net assets	$	108	$	73	$	28	$	7

Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs

The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.



	Derivatives (net)
	Years Ended December 31,
(in millions)	2016			2015
Balance at beginning of period	$	7		$	14
Purchases, sales, issuances and settlements:
Purchases	29			19
Settlements	(24		)	(30		)
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities	4			4
Balance at end of period	$	16		$	7