Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

		December 31, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	3,579	$	3,495	$	57	$	27
Nuclear decommissioning trust fund debt securities			1,553		402		1,100		51
Other trading and available-for-sale equity securities(a)			102		91		11		―
Other trading and available-for-sale debt securities(b)			333		36		277		20
Derivative assets(a)			145		33		70		42
	Total assets		5,712		4,057		1,515		140
Derivative liabilities(c)			(321)		11		(303)		(29)
	Net assets	$	5,391	$	4,068	$	1,212	$	111

		December 31, 2012
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	2,837	$	2,762	$	54	$	21
Nuclear decommissioning trust fund debt securities			1,405		317		1,040		48
Other trading and available-for-sale equity securities(a)			72		63		9		―
Other trading and available-for-sale debt securities(b)			631		40		562		29
Derivative assets(a)			103		18		22		63
	Total assets		5,048		3,200		1,687		161
Derivative liabilities(d)			(756)		(17)		(591)		(148)
	Net assets	$	4,292	$	3,183	$	1,096	$	13
(a)	Included in Other within Current Assets and Other within Investments and Other Assets on the Consolidated Balance Sheet.
(b)	Included in Other within Investments and Other Assets and Short-term Investments on the Consolidated Balance Sheets.
(c)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities on the Consolidated Balance Sheets.

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.
		December 31, 2013
(in millions)			Investments		Derivatives (net)		Total
Balance at December 31, 2012			$	98	$	(85)	$	13
Total pretax realized or unrealized gains (losses) included in earnings(a)				―		(42)		(42)
Purchases, sales, issuances and settlements:
	Purchases			9		21		30
	Sales			(6)		―		(6)
	Issuances			―		11		11
	Settlements			(9)		25		16
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities				6		(3)		3
Transfers out of Level 3(b)				―		86		86
Balance at December 31, 2013			$	98	$	13	$	111
Pretax amounts included in the Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding			$	―	$	10	$	10
(a)	Amounts for derivatives are primarily included in Operating Revenues.
(b)	Transfers reflect derivative contracts becoming observable due to the passage of time.

		December 31, 2012
(in millions)			Investments		Derivatives (net)		Total
Balance at December 31, 2011			$	124	$	(39)	$	85
Amounts acquired in Progress Energy Merger				―		(30)		(30)
Total pretax realized or unrealized gains (losses) included in earnings				―		8		8
Total pretax gains included in other comprehensive income				13		―		13
Purchases, sales, issuances and settlements:
	Purchases			14		22		36
	Sales			(2)		―		(2)
	Issuances			―		(15)		(15)
	Settlements			(55)		(32)		(87)
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities				4		1		5
Balance at December 31, 2012			$	98	$	(85)	$	13

		December 31, 2011
(in millions)			Investments		Derivatives (net)		Total
Balance at December 31, 2010			$	165	$	(19)	$	146
Total pretax realized or unrealized gains (losses) included in earnings				―		(14)		(14)
Total pretax gains included in other comprehensive income				12		―		12
Net purchases, sales, issuances and settlements:
	Purchases			8		8		16
	Sales			(3)		―		(3)
	Settlements			(16)		(16)		(32)
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities				(42)		2		(40)
Balance at December 31, 2011			$	124	$	(39)	$	85

Schedule of Long-term debt, including current

OTHER FAIR VALUE DISCLOSURES
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, 2013				December 31, 2012
(in millions)	Book Value		Fair Value		Book Value		Fair Value
Duke Energy	$	40,256	$	42,592	$	39,461	$	44,001
Duke Energy Carolinas		8,436		9,123		8,741		10,096
Progress Energy		14,115		15,234		14,428		16,563
Duke Energy Progress		5,235		5,323		4,840		5,277
Duke Energy Florida		4,886		5,408		5,320		6,222
Duke Energy Ohio		2,188		2,237		1,997		2,117
Duke Energy Indiana		3,796		4,171		3,702		4,268

Quantitative Information Table - Level 3

QUANTITATIVE INFORMATION ABOUT UNOBSERVABLE INPUTS
The following table provides quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.
	December 31, 2013
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Natural gas contracts	$	(2)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	3.07	$	5.37
FERC mitigation power sale agreements		(2)	Discounted cash flow	Forward electricity curves - price per MWh		25.79	-	52.38
Financial transmission rights (FTRs)		12	RTO auction pricing	FTR price - per Megawatt Hour (MWh)		(0.30)	-	13.80
Electricity contracts		23	Discounted cash flow	Forward electricity curves - price per MWh		20.77	-	58.90
Commodity capacity option contracts		4	Discounted cash flow	Forward capacity option curves - price per MW day		30.40	-	165.10
Reserves		(22)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	13
Duke Energy Carolinas
FERC mitigation power sale agreements	$	(2)	Discounted cash flow	Forward electricity curves - price per MWh	$	25.79	$	52.38
Duke Energy Ohio
Electricity contracts	$	18	Discounted cash flow	Forward electricity curves - price per MWh	$	20.77	$	58.90
Natural gas contracts		(2)	Discounted cash flow	Forward natural gas curves - price per MMBtu		3.07	-	5.37
Reserves		(20)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(4)
Duke Energy Indiana
FTRs	$	12	RTO auction pricing	FTR price - per MWh	$	(0.30)	$	13.80

	December 31, 2012
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Natural gas contracts	$	(53)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	2.33	$	9.99
FERC mitigation power sale agreements		(23)	Discounted cash flow	Forward electricity curves - price per MWh		25.83	-	48.69
FTRs		11	RTO auction pricing	FTR price - per MWh		23.63	-	39.22
Electricity contracts		(8)	Discounted cash flow	Forward electricity curves - price per MWh		24.82	-	77.96
Capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	105.36
Capacity option contracts		3	Discounted cash flow	Forward capacity option curves - price per MW day		4.68	-	77.96
Reserves		(12)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(85)
Duke Energy Carolinas
FERC mitigation power sale agreements	$	(12)	Discounted cash flow	Forward electricity curves - price per MWh	$	25.83	-	48.69
Progress Energy
Natural gas contracts	$	(27)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	4.07	-	4.45
FERC mitigation power sale agreements		(11)	Discounted cash flow	Forward electricity curves - price per MWh		25.83	-	48.69
Total Level 3 derivatives	$	(38)
Duke Energy Progress
Natural gas contracts	$	(27)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	4.07	-	4.45
FERC mitigation power sale agreements		(11)	Discounted cash flow	Forward electricity curves - price per MWh		25.83	-	48.69
Total Level 3 derivatives	$	(38)
Duke Energy Ohio
FTRs	$	1	RTO auction pricing	FTR price - per MWh	$	27.17	$	39.22
Electricity contracts		(1)	Discounted cash flow	Forward electricity curves - price per MWh		25.90	-	57.50
Natural gas contracts		5	Discounted cash flow	Forward natural gas curves - price per MMBtu		3.30	-	4.51
Reserves		(11)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(6)
Duke Energy Indiana
FTRs	$	10	RTO auction pricing	FTR price - per MWh	$	23.63	$	35.43

Duke Energy Carolinas [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

			December 31, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	1,964	$	1,879	$	58	$	27
Nuclear decommissioning trust fund debt securities			870		168		651		51
Other available-for-sale debt securities(a)			3		-		-		3
	Total assets		2,837		2,047		709		81
Derivative liabilities(b)			(2)		―		―		(2)
	Net assets	$	2,835	$	2,047	$	709	$	79

		December 31, 2012
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	1,592	$	1,523	$	48	$	21
Nuclear decommissioning trust fund debt securities			762		155		559		48
Other available-for-sale debt securities(a)			3		―		―		3
	Total assets	$	2,357	$	1,678	$	607	$	72
Derivative liabilities(b)			(12)		―		―		(12)
	Net assets	$	2,345	$	1,678	$	607	$	60
(a)	Included in Other within Investments and Other Assets on the Consolidated Balance Sheets.
(b)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities on the Consolidated Balance Sheet.

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

The following tables provide a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.
		December 31, 2013
			Investments		Derivatives (net)		Total
Balance at December 31, 2012			$	72	$	(12)	$	60
Purchases, sales, issuances and settlements:
	Purchases			9		―		9
	Sales			(6)		―		(6)
	Settlements			―		10		10
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities				6		―		6
Balance at December 31, 2013			$	81	$	(2)	$	79
Pretax amounts included in the Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding			$	―	$	(4)	$	(4)

		December 31, 2012
			Investments		Derivatives (net)		Total
Balance at December 31, 2011			$	65	$	―	$	65
Total pretax gains included in comprehensive income				2		―		2
Purchases, sales, issuances and settlements:
	Purchases			14		―		14
	Issuances			―		(14)		(14)
	Sales			(2)		―		(2)
	Settlements			(11)		2		(9)
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities				4		―		4
Balance at December 31, 2012			$	72	$	(12)	$	60

		December 31, 2011
(in millions)			Investments		Derivatives (net)		Total
Balance at December 31, 2010			$	59	$	―	$	59
Purchases, sales, issuances and settlements:
	Purchases			8		―		8
	Sales			(3)		―		(3)
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities				1		―		1
Balance at December 31, 2011			$	65	$	―	$	65

Progress Energy [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

		December 31, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	1,615	$	1,615	$	―	$	―
Nuclear decommissioning trust fund debt securities and other			677		233		444		―
Other trading and available-for-sale debt securities and other(a)			58		19		39		―
Derivative assets(b)			3		―		3		―
	Total assets		2,353		1,867		486		―
Derivative liabilities(c)			(187)		―		(187)		―
	Net assets	$	2,166	$	1,867	$	299	$	―

		December 31, 2012
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	1,245	$	1,239	$	6	$	―
Nuclear decommissioning trust fund debt securities and other			643		162		481		―
Other trading and available-for-sale debt securities and other(a)			57		17		40		―
Derivative assets(b)			11		―		11		―
	Total assets		1,956		1,418		538		―
Derivative liabilities(c)			(440)		―		(402)		(38)
	Net assets	$	1,516	$	1,418	$	136	$	(38)
(a)	Included in Other within Investments and Other Assets in the Consolidated Balance Sheets.
(b)	Included in Other within Current Assets and Other within Investments and Other Assets in the Consolidated Balance Sheets.
(c)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Consolidated Balance Sheets.

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)		2013		2012		2011
Balance at beginning of period		$	(38)	$	(24)	$	(36)
Total pretax realized or unrealized gains included in earnings			―		1		―
Purchases, sales, issuances and settlements:
	Issuances		10		(16)		―
	Settlements		―		4		―
Total losses included on the Consolidated Balance Sheet as regulatory assets or liabilities			(6)		(3)		(21)
Transfers out of Level 3(a)			34		―		33
Balance at end of period		$	―	$	(38)	$	(24)
Pretax amounts included in the Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding		$	11
(a)	Transfers reflect derivative contracts becoming observable due to the passage of time.

Duke Energy Progress [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

		December 31, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	1,069	$	1,069	$	―	$	―
Nuclear decommissioning trust fund debt securities and other			470		137		333		―
Other trading and available-for-sale debt securities and other(a)			3		3		―		―
Derivative assets(b)			1		―		1		―
	Total assets		1,543		1,209		334		―
Derivative liabilities(c)			(66)		―		(66)		―
	Net assets	$	1,477	$	1,209	$	268	$	―

		December 31, 2012
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	811	$	811	$	―	$	―
Nuclear decommissioning trust fund debt securities and other			448		119		329		―
Other trading and available-for-sale debt securities and other(a)			3		3		―		―
Derivative assets(b)			2		―		2		―
	Total assets		1,264		933		331		―
Derivative liabilities(c)			(166)		―		(128)		(38)
	Net assets	$	1,098	$	933	$	203	$	(38)
(a)	Included in Other within Investments and Other Assets in the Consolidated Balance Sheets.
(b)	Included in Other within Current Assets and Other within Investments and Other Assets in the Consolidated Balance Sheets.
(c)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Consolidated Balance Sheets

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)		2013		2012		2011
Balance at beginning of period		$	(38)	$	(24)	$	(36)
Total pretax realized or unrealized gains included in earnings			―		1		―
Purchases, sales, issuances and settlements:
	Issuances		10		(16)		―
	Settlements		―		4		―
Total losses included on the Consolidated Balance Sheet as regulatory assets or liabilities			(6)		(3)		(20)
Transfers out of Level 3(a)			34		―		32
Balance at end of period		$	―	$	(38)	$	(24)
Pretax amounts included in the Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding		$	11
(a)	Transfers reflect derivative contracts becoming observable due to the passage of time.

Duke Energy Florida [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

		December 31, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	546	$	546	$	―	$	―
Nuclear decommissioning trust fund debt securities and other			214		96		118		―
Other trading and available-for-sale debt securities and other(a)			40		2		38		―
Derivative assets(b)			1		―		1		―
	Total assets		801		644		157		―
Derivative liabilities(c)			(116)		―		(116)		―
	Net assets	$	685	$	644	$	41	$	―

		December 31, 2012
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	435	$	429	$	6	$	―
Nuclear decommissioning trust fund debt securities and other			194		43		151		―
Other trading and available-for-sale debt securities and other(a)			43		3		40		―
Derivative assets(b)			9		―		9		―
	Total assets		681		475		206		―
Derivative liabilities(c)			(270)		―		(270)		―
	Net assets	$	411	$	475	$	(64)	$	―
(a)	Included in Other within Investments and Other Assets in the Consolidated Balance Sheets.
(b)	Included in Other within Current Assets and Other within Investments and Other Assets in the Consolidated Balance Sheets.
(c)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Consolidated Balance Sheets

Duke Energy Ohio [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

		December 31, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Derivative assets(a)		$	96	$	50	$	21	$	25
Derivative liabilities(b)			(95)		(1)		(65)		(29)
	Net assets (liabilities)	$	1	$	49	$	(44)	$	(4)

		December 31, 2012
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Derivative assets(a)		$	59	$	48	$	2	$	9
Derivative liabilities(b)			(38)		(15)		(8)		(15)
	Net assets (liabilities)	$	21	$	33	$	(6)	$	(6)
(a)	Included in Other within Current Assets and Other within Investments and Other Assets in the Consolidated Balance Sheets.
(b)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Consolidated Balance Sheets.

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)		2013		2012		2011
Balance at beginning of period		$	(6)	$	(3)	$	13
Total pretax realized or unrealized gains included in earnings(a)			(42)		(3)		(4)
Purchases, sales, issuances and settlements:
	Purchases		1		―		―
	Settlements		―		1		(14)
Total losses included on the Consolidated Balance Sheet as regulatory assets or liabilities			―		(1)		2
Transfers out of Level 3(b)			43		―		―
Balance at end of period		$	(4)	$	(6)	$	(3)
(a)	Amounts for derivative are primarily included in Operating Revenues.
(b)	Transfers reflect derivative contracts becoming observable due to the passage of time.

Duke Energy Indiana [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities

		December 31, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Available-for-sale equity securities(a)		$	65	$	65	$	―	$	―
Available-for-sale debt securities(a)			29		―		29		―
Derivative assets(b)			12		―		―		12
	Net assets (liabilities)	$	106	$	65	$	29	$	12

		December 31, 2012
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Available-for-sale equity securities(a)		$	49	$	49	$	―	$	―
Available-for-sale debt securities(a)			29		―		29		―
Derivative assets(b)			10		―		―		10
	Total assets		88		49		29		10
Derivative liabilities(c)			(63)		―		(63)		―
	Net assets (liabilities)	$	25	$	49	$	(34)	$	10
(a)	Included in Other within Investments and Other Assets on the Consolidated Balance Sheets.
(b)	Included in Other within Current Assets on the Consolidated Balance Sheets.
(c)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities on the Consolidated Balance Sheets.

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)		2013		2012		2011
Balance at beginning of period		$	10	$	4	$	4
Total pretax realized or unrealized gains included in earnings(a)			8		36		14
Purchases, sales, issuances and settlements:
	Purchases		20		―		8
	Sales		―		22		―
	Settlements		(30)		(52)		(21)
Total losses included on the Consolidated Balance Sheet as regulatory assets or liabilities			4		―		(1)
Balance at end of period		$	12	$	10	$	4
(a)	Amounts in derivatives are primarily included in Operating Revenues.