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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 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 Condensed Consolidated Balance Sheets. Derivative amounts in the table below exclude cash collateral which is disclosed in Note 10. See Note 11 for additional information related to investments by major security type.



	September 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2			Level 3		Not categorized
Nuclear decommissioning trust fund equity securities	$	3,949		$	3,871	$	—		$	—	$	78
Nuclear decommissioning trust fund debt securities	2,169			664		1,505			—		—
Other available-for-sale equity securities	104			104		—			—		—
Other available-for-sale debt securities	297			74		219			4		—
Derivative assets	66			—		43			23		—
Total assets	6,585			4,713		1,767			27		78
Derivative liabilities	(246		)	—		(246		)	—		—
Net assets	$	6,339		$	4,713	$	1,521		$	27	$	78



	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	26			—		16			10		—
Total assets	6,240			4,260		1,793			15		172
Derivative liabilities	(419		)	—		(419		)	—		—
Net assets	$	5,821		$	4,260	$	1,374		$	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.



	Three Months Ended September 30, 2016
(in millions)	Investments		Derivatives (net)			Total
Balance at beginning of period	$	4	$	34		$	38
Purchases, sales, issuances and settlements:
Settlements	—		(9		)	(9		)
Total losses included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—		(2		)	(2		)
Balance at end of period	$	4	$	23		$	27



	Three Months Ended September 30, 2015
(in millions)	Investments		Derivatives (net)			Total
Balance at beginning of period	$	5	$	23		$	28
Purchases, sales, issuances and settlements:
Settlements	—		(6		)	(6		)
Balance at end of period	$	5	$	17		$	22



	Nine Months Ended September 30, 2016
(in millions)	Investments			Derivatives (net)			Total
Balance at beginning of period	$	5		$	10		$	15
Purchases, sales, issuances and settlements:
Purchases	—			34			34
Sales	(1		)	—			(1		)
Settlements	—			(22		)	(22		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—			1			1
Balance at end of period	$	4		$	23		$	27



	Nine Months Ended September 30, 2015
(in millions)	Investments		Derivatives (net)			Total
Balance at beginning of period	$	5	$	(1	)	$	4
Total pretax realized or unrealized gains included in earnings	—		18			18
Purchases, sales, issuances and settlements:
Purchases	—		24			24
Settlements	—		(28		)	(28		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—		4			4
Balance at end of period	$	5	$	17		$	22

Quantitative Information Table - Level 3

The following table includes quantitative information about the Duke Energy Registrants' derivatives classified as Level 3. As of September 30, 2016 and December 31, 2015, all Level 3 derivatives were financial transmission rights (FTRs).



	September 30, 2016
	Fair Value of FTRs
	(in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy	$	23	RTO auction pricing	FTR price – per Megawatt-Hour (MWh)	$	(2.59	)	-	$	8.16
Duke Energy Ohio	3		RTO auction pricing	FTR price – per MWh	0.45			-	2.01
Duke Energy Indiana	20		RTO auction pricing	FTR price – per MWh	(2.59		)	-	8.16



	December 31, 2015
	Fair Value of FTRs
	(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 Fair Value [Table Text Block]

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.



	September 30, 2016				December 31, 2015
(in millions)	Book Value		Fair Value		Book Value		Fair Value
Duke Energy	$	47,165	$	50,997	$	39,569	$	42,537
Duke Energy Carolinas	9,360		10,799		8,367		9,156
Progress Energy	16,520		19,060		14,464		15,856
Duke Energy Progress	7,011		7,787		6,518		6,757
Duke Energy Florida	6,128		7,127		4,266		4,908
Duke Energy Ohio	1,887		2,128		1,598		1,724
Duke Energy Indiana	3,787		4,538		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 Condensed Consolidated Balance Sheets. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 10. See Note 11 for additional information related to investments by major security type.



	September 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2			Level 3		Not categorized
Nuclear decommissioning trust fund equity securities	$	2,170		$	2,092	$	—		$	—	$	78
Nuclear decommissioning trust fund debt securities	1,060			184		876			—		—
Other available-for-sale debt securities	3			—		—			3		—
Derivative assets	10			—		10			—		—
Total assets	3,243			2,276		886			3		78
Derivative liabilities	(99		)	—		(99		)	—		—
Net assets	$	3,144		$	2,276	$	787		$	3	$	78



	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 Condensed Consolidated Balance Sheets. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 10. See Note 11 for additional information related to investments by major security type.



	September 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	1,779		$	1,779	$	—
Nuclear decommissioning trust fund debt securities	1,109			480		629
Other available-for-sale debt securities	67			20		47
Derivative assets	31			—		31
Total assets	2,986			2,279		707
Derivative liabilities	(81		)	—		(81		)
Net assets	$	2,905		$	2,279	$	626



	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



	September 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	1,438		$	1,438	$	—
Nuclear decommissioning trust fund debt securities and other	739			220		519
Other available-for-sale debt securities and other	1			1		—
Derivative assets	15			—		15
Total assets	2,193			1,659		534
Derivative liabilities	(12		)	—		(12		)
Net assets	$	2,181		$	1,659	$	522



	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



	September 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	341		$	341	$	—
Nuclear decommissioning trust fund debt securities and other	370			260		110
Other available-for-sale debt securities and other	49			2		47
Derivative assets	16			—		16
Total assets	776			603		173
Derivative liabilities	(64		)	—		(64		)
Net assets	$	712		$	603	$	109



	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



	September 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2			Level 3
Derivative assets	$	3		$	—	$	—		$	3
Derivative liabilities	(8		)	—		(8		)	—
Net (liabilities) assets	$	(5	)	$	—	$	(8	)	$	3



	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)
	Three Months Ended September 30,
(in millions)	2016			2015
Balance at beginning of period	$	5		$	5
Purchases, sales, issuances and settlements:
Purchases	—			5
Sales	—			(5		)
Settlements	(2		)	(1		)
Balance at end of period	$	3		$	4



	Derivatives (net)
	Nine Months Ended September 30,
(in millions)	2016			2015
Balance at beginning of period	$	3		$	(18	)
Total pretax realized or unrealized gains included in earnings	—			21
Purchases, sales, issuances and settlements:
Purchases	5			5
Settlements	(4		)	(4		)
Total losses included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(1		)	—
Balance at end of period	$	3		$	4

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 Condensed Consolidated Balance Sheets. Derivative amounts in the table below exclude cash collateral, which is disclosed in Note 10. See Note 11 for additional information related to investments by major security type.



	September 30, 2016
(in millions)	Total Fair Value		Level 1		Level 2		Level 3
Other available-for-sale equity securities	$	77	$	77	$	—	$	—
Other available-for-sale debt securities and other	30		—		30		—
Derivative assets	20		—		—		20
Net assets	$	127	$	77	$	30	$	20



	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)
	Three Months Ended September 30,
(in millions)	2016			2015
Balance at beginning of period	$	29		$	17
Purchases, sales, issuances and settlements:
Purchases	—			1
Settlements	(7		)	(6		)
Total losses included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(2		)	—
Balance at end of period	$	20		$	12



	Derivatives (net)
	Nine Months Ended September 30,
(in millions)	2016			2015
Balance at beginning of period	$	7		$	14
Purchases, sales, issuances and settlements:
Purchases	29			19
Settlements	(18		)	(25		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	2			4
Balance at end of period	$	20		$	12