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Fair Value of Financial Assets and Liabilities (Tables)

3 Months Ended

9 Months Ended

12 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities


		September 30, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Investments in available-for-sale auction rate securities^(a)		$	25	$	―	$	―	$	25
Nuclear decommissioning trust fund equity securities			3,280		3,199		59		22
Nuclear decommissioning trust fund debt securities			1,525		392		1,083		50
Other trading and available-for-sale equity securities^(b)			93		83		10		―
Other trading and available-for-sale debt securities^(c)			414		57		357		―
Derivative assets^(b)			127		32		22		73
	Total assets		5,464		3,763		1,531		170
Derivative liabilities^(d)			(473)		(15)		(347)		(111)
	Net assets	$	4,991	$	3,748	$	1,184	$	59


		December 31, 2012
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Investments in available-for-sale auction rate securities^(a)		$	29	$	―	$	―	$	29
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^(b)			72		63		9		―
Other trading and available-for-sale debt securities^(c)			602		40		562		―
Derivative assets^(b)			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 Investments and Other Assets on the Condensed Consolidated Balance Sheets.
(b)	Included in Other within Current Assets and Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
(c)	Included in Other within Investments and Other Assets and Short-term Investments on the Condensed Consolidated Balance Sheets.
(d)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheets.

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

		Three Months Ended September 30, 2013
(in millions)		Available-for-Sale Auction Rate Securities		Available-for-Sale NDTF Investments		Derivatives (net)		Total
Balance at June 30, 2013		$	26	$	71	$	(87)	$	10
Total pretax realized or unrealized gains (losses) included in earnings:
	Revenue: Regulated electric		―		―		4		4
	Revenue: Nonregulated electric, natural gas, and other		―		―		9		9
Total pretax gains included in other comprehensive income:
	Gains on available for sale securities and other		1		―		―		1
Purchases, sales, issuances and settlements:
	Purchases		―		2		―		2
	Sales		―		(2)		―		(2)
	Issuances		―		―		4		4
	Settlements		(2)		―		(3)		(5)
Transfers in and out of Level 3 due to observability of inputs			―		―		34		34
Total gains (losses) included on the Consolidated Balance Sheet as regulatory assets or liabilities			―		1		1		2
Balance at September 30, 2013		$	25	$	72	$	(38)	$	59
Pretax amounts included in the Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding at September 30, 2013
	Revenue: Regulated electric	$	―	$	―	$	3	$	3
	Revenue: Nonregulated electric, natural gas, and other		―		―		(2)		(2)
Total		$	―	$	―	$	1	$	1


		Three Months Ended September 30, 2012
(in millions)		Available-for-Sale Auction Rate Securities		Available-for-Sale NDTF Investments		Derivatives (net)		Total
Balance at June 30, 2012		$	41	$	64	$	(19)	$	86
Amounts acquired in Progress Merger			―		―		(30)		(30)
Total pretax realized or unrealized gains (losses) included in earnings:
	Revenue: Regulated electric		―		―		12		12
	Revenue: Nonregulated electric, natural gas, and other		―		―		(6)		(6)
Total pretax gains included in other comprehensive income:
Purchases, sales, issuances and settlements:
	Purchases		―		1		―		1
	Issuances		―		―		(24)		(24)
	Settlements				―		(10)		(10)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities			―		1		2		3
Balance at September 30, 2012		$	41	$	66	$	(75)	$	32

		Nine Months Ended September 30, 2013
(in millions)		Available-for-Sale Auction Rate Securities		Available-for-Sale NDTF Investments		Derivatives (net)		Total
Balance at December 31, 2012		$	29	$	69	$	(85)	$	13
Total pretax realized or unrealized gains (losses) included in earnings:
	Revenue: Regulated electric		―		―		5		5
	Revenue: Nonregulated electric, natural gas, and other		―		―		(13)		(13)
Total pretax gains included in other comprehensive income:
	Losses on available for sale securities and other		(1)		―		―		(1)
Purchases, sales, issuances and settlements:
	Purchases		―		5		21		26
	Sales		―		(5)		―		(5)
	Issuances		―		―		9		9
	Settlements		(3)		―		(5)		(8)
Transfers in and out of Level 3 due to observability of inputs			―		―		34		34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities			―		3		(4)		(1)
Balance at September 30, 2013		$	25	$	72	$	(38)	$	59
Pretax amounts included in the Condensed Consolidated Statement of Operations related to Level 3 measurements outstanding at September 30, 2013
	Revenue: Regulated electric	$	―	$	―	$	5	$	5
	Revenue: Nonregulated electric, natural gas, and other		―		―		(26)		(26)
Total		$	―	$	―	$	(21)	$	(21)

		Nine Months Ended September 30, 2012
(in millions)		Available-for-Sale Auction Rate Securities		Available-for-Sale NDTF Investments		Derivatives (net)		Total
Balance at December 31, 2011		$	71	$	53	$	(39)	$	85
Amounts acquired in Progress Energy Merger			―		―		(30)		(30)
Total pretax realized or unrealized losses included in earnings:
	Revenue: Regulated electric		―		―		37		37
	Revenue: Nonregulated electric, natural gas, and other		―		―		(9)		(9)
Total pretax gains included in other comprehensive income:
	Gains on available for sale securities and other		9		―		―		9
Purchases, sales, issuances and settlements:
	Purchases		―		10		22		32
	Issuances		―		―		(24)		(24)
	Settlements		(39)		―		(34)		(73)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities			―		3		2		5
Balance at September 30, 2012		$	41	$	66	$	(75)	$	32
Pretax amounts included in the Condensed Consolidated Statement of Operations related to Level 3 measurements outstanding at September 30, 2012.
	Revenue: Nonregulated electric, natural gas, and other	$	―	$	―	$	5	$	5
Total		$	―	$	―	$	5	$	5

Schedule of Long-term debt, including current

		September 30, 2013				December 31, 2012
(in millions)		Book Value		Fair Value		Book Value		Fair Value
Duke Energy ^(a)		$	39,709	$	42,142	$	39,461	$	44,001
Duke Energy Carolinas^(b)			8,739		9,445		8,741		10,096
Progress Energy			13,815		14,989		14,428		16,563
Duke Energy Progress			4,936		5,053		4,840		5,277
Duke Energy Florida			4,887		5,424		5,320		6,222
Duke Energy Ohio			2,188		2,263		1,997		2,117
Duke Energy Indiana			3,798		4,143		3,702		4,268

(a)	Includes book value of Non-recourse long-term debt of variable interest entities of $1,265 million and $852 million September 30, 2013 and December 31, 2012, respectively.
(b)	Includes book value of Non-recourse long-term debt of variable interest entities of $300 million at both September 30, 2013 and December 31, 2012, respectively.

Quantitative Information Table - Level 3

	September 30, 2013
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Commodity natural gas contracts	$	(43)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	3.47	-	10.36
FERC mitigation power sale agreements		(4)	Discounted cash flow	Forward electricity curves - price per megawatt-hour (MWh)		25.79	-	48.34
Financial transmission rights (FTRs)		15	RTO market pricing	FTR price - per MWh		(1.53)	-	10.86
Commodity power contracts		5	Discounted cash flow	Forward electricity curves - price per MWh		26.20	-	54.19
Commodity capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	122.64
Commodity capacity option contracts		4	Discounted cash flow	Forward capacity option curves - price per MW day		29.30	-	100.80
Reserves		(12)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(38)
Duke Energy Carolinas
FERC mitigation power sale agreements	$	(4)	Discounted cash flow	Forward electricity curves - price per MWh	$	25.79	-	48.34
Duke Energy Ohio
Financial transmission rights (FTRs)	$	1	RTO market pricing	FTR price - per MWh	$	(0.09)	-	0.46
Commodity power contracts		13	Discounted cash flow	Forward electricity curves - price per MWh		26.20	-	54.19
Commodity natural gas contracts		(9)	Discounted cash flow	Forward natural gas curves - price per MMBtu		3.47	-	4.55
Reserves		(11)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(6)
Duke Energy Indiana
Financial transmission rights (FTRs)	$	14	RTO market pricing	FTR price - per MWh	$	(1.53)	-	10.86


	December 31, 2012
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Commodity 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
Financial transmission rights (FTRs)		11	RTO market pricing	FTR price - per MWh		23.63	-	39.22
Commodity power contracts		(8)	Discounted cash flow	Forward electricity curves - price per MWh		24.82	-	77.96
Commodity capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	105.36
Commodity 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
Commodity 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
Commodity 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
Financial transmission rights (FTRs)	$	1	RTO market pricing	FTR price - per MWh	$	27.17	-	39.22
Commodity power contracts		(1)	Discounted cash flow	Forward electricity curves - price per MWh		25.90	-	57.50
Commodity 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
Financial transmission rights (FTRs)	$	10	RTO market 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


			September 30, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Investments in available-for-sale auction rate securities^(a)		$	3	$	―	$	―	$	3
Nuclear decommissioning trust fund equity securities			1,790		1,715		53		22
Nuclear decommissioning trust fund debt securities			883		220		613		50
	Total assets		2,676		1,935		666		75
Derivative liabilities^(b)			(4)		―		―		(4)
	Net assets	$	2,672	$	1,935	$	666	$	71


		December 31, 2012
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Investments in available-for-sale auction rate securities^(a)		$	3	$	―	$	―	$	3
Nuclear decommissioning trust fund equity securities			1,592		1,523		48		21
Nuclear decommissioning trust fund debt securities			762		155		559		48
	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 Condensed Consolidated Balance Sheets.
(b)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.

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

		Three Months Ended September 30, 2013
(in millions)		Available-for-Sale Auction Rate Securities		Available-for-Sale NDTF Investments		Derivatives (net)		Total
Balance at June 30, 2013		$	3	$	71	$	(4)	$	70
Purchases, sales, issuances and settlements:
	Purchases		―		2		―		2
	Sales		―		(2)		―		(2)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities			―		1		―		1
Balance at September 30, 2013		$	3	$	72	$	(4)	$	71


		Three Months Ended September 30, 2012
(in millions)		Available-for-Sale Auction Rate Securities		Available-for-Sale NDTF Investments		Derivatives (net)		Total
Balance at June 30, 2012		$	6	$	64	$	―	$	70
Purchases, sales, issuances and settlements:
	Purchases		―		1		―		1
	Issuances		―		―		(14)		(14)
	Settlements		―		―		2		2
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities			―		1		―		1
Balance at September 30, 2012		$	6	$	66	$	(12)	$	60

		Nine Months Ended September 30, 2013
(in millions)		Available-for-Sale Auction Rate Securities		Available-for-Sale NDTF Investments		Derivatives (net)		Total
Balance at December 31, 2012		$	3	$	69	$	(12)	$	60
Purchases, sales, issuances and settlements:
	Purchases		―		5		―		5
	Sales		―		(5)		―		(5)
	Settlements		―		―		8		8
Total gains included on the Consolidated Balance Sheet as regulatory assets or liabilities			―		3		―		3
Balance at September 30, 2013		$	3	$	72	$	(4)	$	71
Pretax amounts included in the Condensed Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding at September 30, 2013
	Operating Revenues	$	―	$	―	$	(4)	$	(4)
Total		$	―	$	―	$	(4)	$	(4)

		Nine Months Ended September 30, 2012
(in millions)		Available-for-Sale Auction Rate Securities		Available-for-Sale NDTF Investments		Derivatives (net)		Total
Balance at December 31, 2011		$	12	$	53	$	―	$	65
Total pretax gains included in other comprehensive income:
	Gains on available for sale securities and other		2		―		―		2
Purchases, sales, issuances and settlements:
	Purchases		―		10		―		10
	Issuances		―		―		(14)		(14)
	Settlements		(8)		―		2		(6)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities			―		3		―		3
Balance at September 30, 2012		$	6	$	66	$	(12)	$	60

Quantitative Information Table - Level 3

	September 30, 2013
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Commodity natural gas contracts	$	(43)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	3.47	-	10.36
FERC mitigation power sale agreements		(4)	Discounted cash flow	Forward electricity curves - price per megawatt-hour (MWh)		25.79	-	48.34
Financial transmission rights (FTRs)		15	RTO market pricing	FTR price - per MWh		(1.53)	-	10.86
Commodity power contracts		5	Discounted cash flow	Forward electricity curves - price per MWh		26.20	-	54.19
Commodity capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	122.64
Commodity capacity option contracts		4	Discounted cash flow	Forward capacity option curves - price per MW day		29.30	-	100.80
Reserves		(12)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(38)
Duke Energy Carolinas
FERC mitigation power sale agreements	$	(4)	Discounted cash flow	Forward electricity curves - price per MWh	$	25.79	-	48.34
Duke Energy Ohio
Financial transmission rights (FTRs)	$	1	RTO market pricing	FTR price - per MWh	$	(0.09)	-	0.46
Commodity power contracts		13	Discounted cash flow	Forward electricity curves - price per MWh		26.20	-	54.19
Commodity natural gas contracts		(9)	Discounted cash flow	Forward natural gas curves - price per MMBtu		3.47	-	4.55
Reserves		(11)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(6)
Duke Energy Indiana
Financial transmission rights (FTRs)	$	14	RTO market pricing	FTR price - per MWh	$	(1.53)	-	10.86


	December 31, 2012
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Commodity 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
Financial transmission rights (FTRs)		11	RTO market pricing	FTR price - per MWh		23.63	-	39.22
Commodity power contracts		(8)	Discounted cash flow	Forward electricity curves - price per MWh		24.82	-	77.96
Commodity capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	105.36
Commodity 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
Commodity 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
Commodity 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
Financial transmission rights (FTRs)	$	1	RTO market pricing	FTR price - per MWh	$	27.17	-	39.22
Commodity power contracts		(1)	Discounted cash flow	Forward electricity curves - price per MWh		25.90	-	57.50
Commodity 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
Financial transmission rights (FTRs)	$	10	RTO market pricing	FTR price - per MWh	$	23.63	-	35.43

Progress Energy [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities


		September 30, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	1,489	$	1,483	$	6	$	―
Nuclear decommissioning trust fund debt securities and other			642		172		470		―
Other trading and available-for-sale debt securities and other^(a)			55		19		36		―
	Total assets		2,186		1,674		512		―
Derivative liabilities^(c)			(282)		―		(282)		―
	Net assets	$	1,904	$	1,674	$	230	$	―


		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 Condensed Consolidated Balance Sheets.
(b)	Included in Other Current Assets within Current Assets and Other within Investments and Other Assets in the Condensed Consolidated Balance Sheets.
(c)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Condensed Consolidated Balance Sheets.

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

		Derivatives (net)
		Three Months Ended September 30,
(in millions)				2013		2012
Balance at beginning of period			$	(35)	$	(30)
Total pretax realized or unrealized gains included in earnings:
	Revenue: Regulated electric			―		2
Purchases, sales, issuances and settlements:
	Issuances			2		(16)
	Settlements			―		4
Total (losses) gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities				(1)		4
Transfers in and out of Level 3 due to observability of inputs				34		―
Balance at end of period			$	―	$	(36)


		Derivatives (net)
		Nine Months Ended September 30,
(in millions)				2013		2012
Balance at beginning of period			$	(38)	$	(24)
Total pretax realized or unrealized gains included in earnings:
	Operating Revenues			―		2
Purchases, sales, issuances and settlements:
	Issuances			10		(16)
	Settlements			―		4
Total losses included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities				(6)		(2)
Transfers in and out of Level 3 due to observability of inputs				34		―
Balance at end of period			$	―	$	(36)
Pretax amounts included in the Condensed Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding at September 30, 2013
	Revenue: Regulated electric		$	10	$	―
Total			$	10	$	―

Quantitative Information Table - Level 3


	December 31, 2012
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Commodity 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
Financial transmission rights (FTRs)		11	RTO market pricing	FTR price - per MWh		23.63	-	39.22
Commodity power contracts		(8)	Discounted cash flow	Forward electricity curves - price per MWh		24.82	-	77.96
Commodity capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	105.36
Commodity 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
Commodity 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
Commodity 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
Financial transmission rights (FTRs)	$	1	RTO market pricing	FTR price - per MWh	$	27.17	-	39.22
Commodity power contracts		(1)	Discounted cash flow	Forward electricity curves - price per MWh		25.90	-	57.50
Commodity 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
Financial transmission rights (FTRs)	$	10	RTO market pricing	FTR price - per MWh	$	23.63	-	35.43

Duke Energy Progress [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities


		September 30, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	985	$	985	$	―	$	―
Nuclear decommissioning trust fund debt securities and other			440		112		328		―
Other trading and available-for-sale debt securities and other^(a)			2		2		―		―
	Total assets		1,427		1,099		328		―
Derivative liabilities^(c)			(107)		―		(107)		―
	Net assets	$	1,320	$	1,099	$	221	$	―


		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 Condensed Consolidated Balance Sheets.
(b)	Included in Other Current Assets within Current Assets and Other within Investments and Other Assets in the Condensed Consolidated Balance Sheets.
(c)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Condensed Consolidated Balance Sheets.

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

		Derivatives (net)
		Three Months Ended September 30,
(in millions)				2013		2012
Balance at beginning of period			$	(35)	$	(28)
Total pretax realized or unrealized gains (losses) included in earnings:
	Operating Revenues			―		2
Purchases, sales, issuances and settlements:
	Issuances					(16)
	Settlements			2		4
Total (losses) gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities				(1)		2
Transfers in and out of Level 3 due to observability of inputs				34		―
Balance at end of period			$	―	$	(36)
Pretax amounts included in the Condensed Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding at September 30, 2013
	Revenue: Regulated electric		$	1	$	―
Total			$	1	$	―


		Derivatives (net)
		Nine Months Ended September 30,
(in millions)				2013		2012
Balance at beginning of period			$	(38)	$	(24)
Total pretax realized or unrealized gains (losses) included in earnings:
	Operating Revenues			―		2
Purchases, sales, issuances and settlements:
	Issuances			9		(16)
	Settlements			―		4
Total losses included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities				(5)		(2)
Transfers in and out of Level 3 due to observability of inputs				34		―
Balance at end of period			$	―	$	(36)
Pretax amounts included in the Condensed Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding at September 30, 2013
	Revenue: Regulated electric		$	10	$	―
Total			$	10	$	―

Quantitative Information Table - Level 3


	December 31, 2012
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Commodity 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
Financial transmission rights (FTRs)		11	RTO market pricing	FTR price - per MWh		23.63	-	39.22
Commodity power contracts		(8)	Discounted cash flow	Forward electricity curves - price per MWh		24.82	-	77.96
Commodity capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	105.36
Commodity 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
Commodity 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
Commodity 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
Financial transmission rights (FTRs)	$	1	RTO market pricing	FTR price - per MWh	$	27.17	-	39.22
Commodity power contracts		(1)	Discounted cash flow	Forward electricity curves - price per MWh		25.90	-	57.50
Commodity 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
Financial transmission rights (FTRs)	$	10	RTO market pricing	FTR price - per MWh	$	23.63	-	35.43

Duke Energy Florida [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities


		September 30, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Nuclear decommissioning trust fund equity securities		$	505	$	499	$	6	$	―
Nuclear decommissioning trust fund debt securities and other			202		60		142		―
Other trading and available-for-sale debt securities and other^(a)			39		2		37		―
	Total assets		746		561		185		―
Derivative liabilities^(b)			(171)		―		(171)		―
	Net assets	$	575	$	561	$	14	$	―


		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			9		―		9		―
	Total assets		681		475		206		―
Derivative liabilities^(b)			(270)		―		(270)		―
	Net assets (liabilities)	$	411	$	475	$	(64)	$	―

(a)	Included in Other within Investments and Other Assets in the Condensed Balance Sheets.
(b)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Condensed Balance Sheets

Duke Energy Ohio [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities


		September 30, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Derivative assets^(a)		$	70	$	49	$	―	$	21
Derivative liabilities^(b)			(46)		(14)		(5)		(27)
	Net assets (liabilities)	$	24	$	35	$	(5)	$	(6)


		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 Condensed Consolidated Balance Sheets.
(b)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Condensed Consolidated Balance Sheets.

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

		Derivatives (net)
		Three Months Ended September 30,
(in millions)				2013		2012
Balance at beginning of period			$	(19)	$	(2)
Total pretax realized or unrealized gains (losses) included in earnings:
	Revenue: Regulated electric			―		1
	Revenue: Nonregulated electric and other			11		(6)
Purchases, sales, issuances and settlements:
	Settlements			2		(1)
Balance at end of period			$	(6)	$	(8)
Pretax amounts included in the Condensed Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding at September 30, 2013:
	Revenue: Nonregulated electric and other		$	(3)	$	―
Total			$	(3)	$	―


		Derivatives (net)
		Nine Months Ended September 30,
(in millions)				2013		2012
Balance at beginning of period			$	(6)	$	(3)
Total pretax realized or unrealized gains (losses) included in earnings:
	Revenue: Regulated electric			―		1
	Revenue: Nonregulated electric and other			(4)		(5)
Purchases, sales, issuances and settlements:
	Purchases			1		―
	Settlements			―		1
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities				3		(2)
Balance at end of period			$	(6)	$	(8)
Pretax amounts included in the Consolidated Statements of Operations and Comprehensive Income related to Level 3 measurements outstanding at September 30, 2013:
	Revenue: Nonregulated electric and other		$	(16)	$	1
Total			$	(16)	$	1

Quantitative Information Table - Level 3

	September 30, 2013
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Commodity natural gas contracts	$	(43)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	3.47	-	10.36
FERC mitigation power sale agreements		(4)	Discounted cash flow	Forward electricity curves - price per megawatt-hour (MWh)		25.79	-	48.34
Financial transmission rights (FTRs)		15	RTO market pricing	FTR price - per MWh		(1.53)	-	10.86
Commodity power contracts		5	Discounted cash flow	Forward electricity curves - price per MWh		26.20	-	54.19
Commodity capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	122.64
Commodity capacity option contracts		4	Discounted cash flow	Forward capacity option curves - price per MW day		29.30	-	100.80
Reserves		(12)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(38)
Duke Energy Carolinas
FERC mitigation power sale agreements	$	(4)	Discounted cash flow	Forward electricity curves - price per MWh	$	25.79	-	48.34
Duke Energy Ohio
Financial transmission rights (FTRs)	$	1	RTO market pricing	FTR price - per MWh	$	(0.09)	-	0.46
Commodity power contracts		13	Discounted cash flow	Forward electricity curves - price per MWh		26.20	-	54.19
Commodity natural gas contracts		(9)	Discounted cash flow	Forward natural gas curves - price per MMBtu		3.47	-	4.55
Reserves		(11)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(6)
Duke Energy Indiana
Financial transmission rights (FTRs)	$	14	RTO market pricing	FTR price - per MWh	$	(1.53)	-	10.86


	December 31, 2012
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Commodity 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
Financial transmission rights (FTRs)		11	RTO market pricing	FTR price - per MWh		23.63	-	39.22
Commodity power contracts		(8)	Discounted cash flow	Forward electricity curves - price per MWh		24.82	-	77.96
Commodity capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	105.36
Commodity 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
Commodity 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
Commodity 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
Financial transmission rights (FTRs)	$	1	RTO market pricing	FTR price - per MWh	$	27.17	-	39.22
Commodity power contracts		(1)	Discounted cash flow	Forward electricity curves - price per MWh		25.90	-	57.50
Commodity 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
Financial transmission rights (FTRs)	$	10	RTO market pricing	FTR price - per MWh	$	23.63	-	35.43

Duke Energy Indiana [Member]

Fair Value Disclosures [Line Items]

Fair Value Measurement Amounts For Assets And Liabilities


		September 30, 2013
(in millions)		Total Fair Value		Level 1		Level 2		Level 3
Available-for-sale equity securities^(a)		$	60	$	60	$	―	$	―
Available-for-sale debt securities^(a)			28		―		28		―
Derivative assets^(b)			14		―		―		14
	Total assets		102		60		28	$	14
	Net assets (liabilities)	$	102	$	60	$	28	$	14


		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 Condensed Consolidated Balance Sheets.
(b)	Included in Other within Current Assets on the Condensed Consolidated Balance Sheets.
(c)	Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheets.

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

		Derivatives (net)
		Three Months Ended September 30,
(in millions)				2013		2012
Balance at beginning of period			$	18	$	22
Total pretax realized or unrealized gains (losses) included in earnings:
	Operating Revenues			3		11
Purchases, sales, issuances and settlements:
	Settlements			(10)		(16)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities				3		―
Balance at end of period			$	14	$	17


		Derivatives (net)
		Nine Months Ended September 30,
(in millions)				2013		2012
Balance at beginning of period			$	10	$	4
Total pretax realized or unrealized gains (losses) included in earnings:
	Operating Revenues			5		35
Purchases, sales, issuances and settlements:
	Purchases			20		―
	Sales			―		22
	Settlements			(23)		(45)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities				2		1
Balance at end of period			$	14	$	17

Quantitative Information Table - Level 3

	September 30, 2013
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Commodity natural gas contracts	$	(43)	Discounted cash flow	Forward natural gas curves - price per MMBtu	$	3.47	-	10.36
FERC mitigation power sale agreements		(4)	Discounted cash flow	Forward electricity curves - price per megawatt-hour (MWh)		25.79	-	48.34
Financial transmission rights (FTRs)		15	RTO market pricing	FTR price - per MWh		(1.53)	-	10.86
Commodity power contracts		5	Discounted cash flow	Forward electricity curves - price per MWh		26.20	-	54.19
Commodity capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	122.64
Commodity capacity option contracts		4	Discounted cash flow	Forward capacity option curves - price per MW day		29.30	-	100.80
Reserves		(12)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(38)
Duke Energy Carolinas
FERC mitigation power sale agreements	$	(4)	Discounted cash flow	Forward electricity curves - price per MWh	$	25.79	-	48.34
Duke Energy Ohio
Financial transmission rights (FTRs)	$	1	RTO market pricing	FTR price - per MWh	$	(0.09)	-	0.46
Commodity power contracts		13	Discounted cash flow	Forward electricity curves - price per MWh		26.20	-	54.19
Commodity natural gas contracts		(9)	Discounted cash flow	Forward natural gas curves - price per MMBtu		3.47	-	4.55
Reserves		(11)		Bid-ask spreads, implied volatility, probability of default
Total Level 3 derivatives	$	(6)
Duke Energy Indiana
Financial transmission rights (FTRs)	$	14	RTO market pricing	FTR price - per MWh	$	(1.53)	-	10.86


	December 31, 2012
Investment Type	Fair Value (in millions)		Valuation Technique	Unobservable Input	Range
Duke Energy
Commodity 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
Financial transmission rights (FTRs)		11	RTO market pricing	FTR price - per MWh		23.63	-	39.22
Commodity power contracts		(8)	Discounted cash flow	Forward electricity curves - price per MWh		24.82	-	77.96
Commodity capacity contracts		(3)	Discounted cash flow	Forward capacity curves - price per MW day		95.16	-	105.36
Commodity 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
Commodity 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
Commodity 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
Financial transmission rights (FTRs)	$	1	RTO market pricing	FTR price - per MWh	$	27.17	-	39.22
Commodity power contracts		(1)	Discounted cash flow	Forward electricity curves - price per MWh		25.90	-	57.50
Commodity 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
Financial transmission rights (FTRs)	$	10	RTO market pricing	FTR price - per MWh	$	23.63	-	35.43

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References+ Details