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Fair Value Measurements (Tables)

3 Months Ended

Mar. 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 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.



	March 31, 2016
(in millions)	Total Fair Value			Level 1			Level 2			Level 3		Not categorized
Nuclear decommissioning trust fund equity securities	$	3,592		$	3,426		$	1		$	—	$	165
Nuclear decommissioning trust fund debt securities	2,302			935			1,367			—
Other available-for-sale equity securities	97			97			—			—		—
Other available-for-sale debt securities	307			85			218			4
Derivative assets	33			—			31			2
Total assets	6,331			4,543			1,617			6		165
Derivative liabilities	(537		)	(6		)	(531		)	—
Net assets	$	5,794		$	4,537		$	1,086		$	6	$	165



	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 March 31, 2016
(in millions)	Investments			Derivatives (net)			Total
Balance at beginning of period	$	5		$	10		$	15
Purchases, sales, issuances and settlements:
Sales	(1		)	—			(1		)
Settlements	—			(7		)	(7		)
Total losses included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—			(1		)	(1		)
Balance at end of period	$	4		$	2		$	6



	Three Months Ended March 31, 2015
(in millions)	Investments		Derivatives (net)			Total
Balance at beginning of period	$	5	$	(1	)	$	4
Total pretax realized or unrealized gains included in earnings	—		24			24
Purchases, sales, issuances and settlements:
Settlements	—		(10		)	(10		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—		1			1
Balance at end of period	$	5	$	14		$	19

Quantitative Information Table - Level 3

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



	March 31, 2016
	Fair Value of FTRs
	(in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy	$	2	RTO auction pricing	FTR price – per Megawatt-Hour (MWh)	$	(1.67	)	-	$	5.29
Duke Energy Indiana	2		RTO auction pricing	FTR price – per MWh	(1.67		)	-	5.29



	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.



	March 31, 2016				December 31, 2015
(in millions)	Book Value		Fair Value		Book Value		Fair Value
Duke Energy	$	40,307	$	44,785	$	39,569	$	42,537
Duke Energy Carolinas	9,360		10,567		8,367		9,156
Progress Energy	14,210		16,245		14,464		15,856
Duke Energy Progress	6,565		7,134		6,518		6,757
Duke Energy Florida	4,265		5,109		4,266		4,908
Duke Energy Ohio	1,642		1,836		1,598		1,724
Duke Energy Indiana	3,768		4,362		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.



	March 31, 2016
(in millions)	Total Fair Value			Level 1		Level 2			Level 3		Not categorized
Nuclear decommissioning trust fund equity securities	$	2,088		$	1,922	$	1		$	—	$	165
Nuclear decommissioning trust fund debt securities	1,000			264		736			—
Other available-for-sale debt securities	3			—		—			3
Derivative assets	13			—		13			—
Total assets	3,104			2,186		750			3		165
Derivative liabilities	(81		)	—		(81		)	—
Net assets	$	3,023		$	2,186	$	669		$	3	$	165



	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.



	March 31, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	1,504		$	1,504	$	—
Nuclear decommissioning trust fund debt securities	1,302			671		631
Other available-for-sale debt securities	63			17		46
Derivative assets	17			—		17
Total assets	2,886			2,192		694
Derivative liabilities	(298		)	—		(298		)
Net assets	$	2,588		$	2,192	$	396



	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



	March 31, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	1,184		$	1,184	$	—
Nuclear decommissioning trust fund debt securities and other	888			389		499
Other available-for-sale debt securities and other	1			1		—
Derivative assets	5			—		5
Total assets	2,078			1,574		504
Derivative liabilities	(87		)	—		(87		)
Net assets	$	1,991		$	1,574	$	417



	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



	March 31, 2016
(in millions)	Total Fair Value			Level 1		Level 2
Nuclear decommissioning trust fund equity securities	$	320		$	320	$	—
Nuclear decommissioning trust fund debt securities and other	414			282		132
Other available-for-sale debt securities and other	47			1		46
Derivative assets	11			—		11
Total assets	792			603		189
Derivative liabilities	(206		)	—		(206		)
Net assets (liabilities)	$	586		$	603	$	(17	)



	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



	March 31, 2016
(in millions)	Total Fair Value			Level 1		Level 2			Level 3
Derivative liabilities	$	(7	)	$	—	$	(7	)	$	—
Net liabilities	$	(7	)	$	—	$	(7	)	$	—



	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 March 31,
(in millions)	2016			2015
Balance at beginning of period	$	3		$	(18	)
Total pretax realized or unrealized gains included in earnings	—			25
Purchases, sales, issuances and settlements:
Settlements	(2		)	—
Total losses included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	(1		)	—
Balance at end of period	$	—		$	7

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.



	March 31, 2016
(in millions)	Total Fair Value		Level 1		Level 2		Level 3
Other available-for-sale equity securities	$	72	$	72	$	—	$	—
Other available-for-sale debt securities and other	30		1		29		—
Derivative assets	2		—		—		2
Net assets	$	104	$	73	$	29	$	2



	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 March 31,
(in millions)	2016			2015
Balance at beginning of period	$	7		$	14
Total pretax realized or unrealized losses included in earnings	—			(3		)
Purchases, sales, issuances and settlements:
Settlements	(5		)	(9		)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities	—			1
Balance at end of period	$	2		$	3