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Fair Value Measurements (Tables)

6 Months Ended

Jun. 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 9. See Note 10 for additional information related to investments by major security type.



	June 30, 2016
(in millions)	Total Fair Value			Level 1			Level 2			Level 3		Not categorized
Nuclear decommissioning trust fund equity securities	$	3,834		$	3,666		$	1		$	—	$	167
Nuclear decommissioning trust fund debt securities	2,158			744			1,414			—		—
Other available-for-sale equity securities	98			98			—			—		—
Other available-for-sale debt securities	308			74			230			4		—
Derivative assets	108			2			72			34		—
Total assets	6,506			4,584			1,717			38		167
Derivative liabilities	(428		)	(1		)	(427		)	—		—
Net assets	$	6,078		$	4,583		$	1,290		$	38	$	167



	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. There was no change to the Level 3 balance during the three months ended June 30, 2015.



	Three Months Ended June 30, 2016
(in millions)	Investments		Derivatives (net)			Total
Balance at beginning of period	$	4	$	2		$	6
Purchases, sales, issuances and settlements:
Purchases	—		34			34
Settlements	—		(6		)	(6		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—		4			4
Balance at end of period	$	4	$	34		$	38



	Six Months Ended June 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	—			(13		)	(13		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—			3			3
Balance at end of period	$	4		$	34		$	38



	Six Months Ended June 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	—		(22		)	(22		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—		4			4
Balance at end of period	$	5	$	23		$	28

Quantitative Information Table - Level 3

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



	June 30, 2016
	Fair Value of FTRs
	(in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy	$	34	RTO auction pricing	FTR price – per Megawatt-Hour (MWh)	$	(1.64	)	-	$	8.64
Duke Energy Ohio	5		RTO auction pricing	FTR price – per MWh	0.36			-	2.47
Duke Energy Indiana	29		RTO auction pricing	FTR price – per MWh	(1.64		)	-	8.64



	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.



	June 30, 2016				December 31, 2015
(in millions)	Book Value		Fair Value		Book Value		Fair Value
Duke Energy	$	42,273	$	47,953	$	39,569	$	42,537
Duke Energy Carolinas	9,360		10,874		8,367		9,156
Progress Energy	15,486		16,715		14,464		15,856
Duke Energy Progress	6,565		7,344		6,518		6,757
Duke Energy Florida	5,540		5,226		4,266		4,908
Duke Energy Ohio	1,887		2,134		1,598		1,724
Duke Energy Indiana	3,937		4,717		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 9. See Note 10 for additional information related to investments by major security type.



	June 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2			Level 3		Not categorized
Nuclear decommissioning trust fund equity securities	$	2,128		$	1,960	$	1		$	—	$	167
Nuclear decommissioning trust fund debt securities	1,035			245		790			—		—
Other available-for-sale debt securities	3			—		—			3		—
Derivative assets	18			—		18			—		—
Total assets	3,184			2,205		809			3		167
Derivative liabilities	(89		)	—		(89		)	—		—
Net assets	$	3,095		$	2,205	$	720		$	3	$	167



	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 9. See Note 10 for additional information related to investments by major security type.



	June 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	1,706		$	1,706	$	—
Nuclear decommissioning trust fund debt securities	1,123			499		624
Other available-for-sale debt securities	68			21		47
Derivative assets	54			—		54
Total assets	2,951			2,226		725
Derivative liabilities	(100		)	—		(100		)
Net assets	$	2,851		$	2,226	$	625



	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



	June 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	1,379		$	1,379	$	—
Nuclear decommissioning trust fund debt securities and other	727			228		499
Other available-for-sale debt securities and other	1			1		—
Derivative assets	25			—		25
Total assets	2,132			1,608		524
Derivative liabilities	(18		)	—		(18		)
Net assets	$	2,114		$	1,608	$	506



	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



	June 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	327		$	327	$	—
Nuclear decommissioning trust fund debt securities and other	396			271		125
Other available-for-sale debt securities and other	51			4		47
Derivative assets	29			—		29
Total assets	803			602		201
Derivative liabilities	(76		)	—		(76		)
Net assets	$	727		$	602	$	125



	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



	June 30, 2016
(in millions)	Total Fair Value			Level 1		Level 2			Level 3
Derivative assets	$	5		$	—	$	—		$	5
Derivative liabilities	(8		)	—		(8		)	—
Net (liabilities) assets	$	(3	)	$	—	$	(8	)	$	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)
	Three Months Ended June 30,
(in millions)	2016		2015
Balance at beginning of period	$	—	$	7
Total pretax realized or unrealized gains included in earnings	—		(4		)
Purchases, sales, issuances and settlements:
Purchases	5		—
Sales	—		5
Settlements	—		(3		)
Balance at end of period	$	5	$	5



	Derivatives (net)
	Six Months Ended June 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			—
Sales	—			5
Settlements	(2		)	(3		)
Total losses included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(1		)	—
Balance at end of period	$	5		$	5

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 9. See Note 10 for additional information related to investments by major security type.



	June 30, 2016
(in millions)	Total Fair Value			Level 1			Level 2		Level 3
Other available-for-sale equity securities	$	73		$	73		$	—	$	—
Other available-for-sale debt securities and other	31			—			31		—
Derivative assets	31			2			—		29
Total assets	135			75			31		29
Derivative liabilities	(1		)	(1		)	—		—
Net assets	$	134		$	74		$	31	$	29



	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 June 30,
(in millions)	2016			2015
Balance at beginning of period	$	2		$	3
Purchases, sales, issuances and settlements:
Purchases	29			18
Settlements	(6		)	(10		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	4			6
Balance at end of period	$	29		$	17



	Derivatives (net)
	Six Months Ended June 30,
(in millions)	2016			2015
Balance at beginning of period	$	7		$	14
Purchases, sales, issuances and settlements:
Purchases	29			18
Settlements	(11		)	(19		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	4			4
Balance at end of period	$	29		$	17