Fair Value Of Financial Assets And Liabilities (Tables)

9 Months Ended

Sep. 30, 2011

Fair Value Of Financial Assets And Liabilities

Fair Value Measurement Amounts For Assets And Liabilities

	Total Fair Value Amounts at September 30, 2011			Level 1			Level 2			Level 3
	(in millions)
Description
Investments in available-for-sale auction rate securities(a)	$	97		$	—		$	25		$	72
Nuclear decommissioning trust fund equity securities		1,206			1,154			46			6
Nuclear decommissioning trust fund debt securities		718			151			519			48
Other long-term trading and available-for-sale equity securities(b)		62			55			7			—
Other trading and available-for-sale debt securities(c)		330			27			303			—
Derivative assets(d)		89			15			9			65
Total Assets	$	2,502		$	1,402		$	909		$	191
Derivative liabilities(e)		(349	)		(57	)		(203	)		(89	)
Net Assets	$	2,153		$	1,345		$	706		$	102

(a) $72 million of these securities are included in Other within Investments and Other Assets and $25 million are classified as Short-Term Investments 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 Sheets.

(c) $209 million of these securities are included in Other within Investments and Other Assets and $121 million are classified as Short-Term Investments on the Condensed Consolidated Balance Sheets.

(d) Included in Other within Current Assets and Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

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

	Total Fair Value Amounts at December 31, 2010			Level 1			Level 2			Level 3
	(in millions)
Description
Investments in available-for-sale auction rate securities(a)	$	118		$	—		$	—		$	118
Nuclear decommissioning trust fund equity securities		1,365			1,313			46			6
Nuclear decommissioning trust fund debt securities		649			35			573			41
Other long-term trading and available-for-sale equity securities(a)		164			157			7			—
Other long-term trading and available-for-sale debt securities(a)		221			10			211			—
Derivative assets(b)		186			21			81			84
Total Assets	$	2,703		$	1,536		$	918		$	249
Derivative liabilities(c)		(132	)		(8	)		(21	)		(103	)
Net Assets	$	2,571		$	1,528		$	897		$	146

(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 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

	Available-for- Sale Auction Rate Securities			Available-for- Sale NDTF Investments		Derivatives (net)			Total
Three Months Ended September 30, 2011
Balance at July 1, 2011	$	90		$	53	$	(22	)	$	121
Total pre-tax realized or unrealized gains included in earnings:
Revenue, regulated electric(a)		—			—		8			8
Total pre-tax gains included in other comprehensive income:
Gains on available for sale securities and other		8			—		—			8
Purchases, sales, issuances and settlements:
Purchases(a)		—			—		8			8
Settlements		(1	)		—		(2	)		(3	)
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory asset or liability		—			1		(16	)		(15	)
Transfers out of Level 3		(25	)							(25	)
Balance at September 30, 2011	$	72		$	54	$	(24	)	$	102
(a)    Derivative amounts relate to financial transmission rights.
Three Months Ended September 30, 2010
Balance at July 1, 2010	$	178		$	48	$	(7	)	$	219

Total pre-tax realized or unrealized losses included in earnings:
Revenue, non-regulated electric, natural gas, and other		—			—			(15	)		(15	)
Fuel used in electric generation and purchased power—non-regulated		—			—			(3	)		(3	)
Total pre-tax gains included in other comprehensive income:
Gains on available for sale securities and other		2			—			—			2
Net purchases, sales, issuances and settlements		(3	)		(4	)		2			(5	)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory asset or liability		—			2			1			3
Balance at September 30, 2010	$	177		$	46		$	(22	)	$	201
	Available-for- Sale Auction Rate Securities			Available-for- Sale NDTF Investments			Derivatives (net)			Total
Nine months Ended September 30, 2011
Balance at January 1, 2011	$	118		$	47		$	(19	)	$	146
Total pre-tax realized or unrealized gains (losses) included in earnings:
Revenue, regulated electric(a)		—			—			8			8
Revenue, non-regulated electric, natural gas, and other		—			—			(19	)		(19	)
Total pre-tax gains included in other comprehensive income:
Gains on available for sale securities and other		13			—			—			13
Net purchases, sales, issuances and settlements:
Purchases(a)		—			7			8			15
Sales		—			(3	)		—			(3	)
Settlements		(25	)		—			(5	)		(30	)
Total gains included on the Condensed Consolidated Balance Sheet as regulatory asset or liability or as non-current liability		—			3			3			6
Transfers out of Level 3		(34	)								(34	)
Balance at September 30, 2011	$	72		$	54		$	(24	)	$	102
Pre-tax amounts included in the Condensed Consolidated Statements of Operations related to Level 3 measurements outstanding at September 30, 2011:
Revenue, non-regulated electric, natural gas, and other	$	—		$	—		$	(12	)	$	(12	)
Total	$	—		$	—		$	(12	)	$	(12	)
(a)    Derivative amounts relate to financial transmission rights
Nine months Ended September 30, 2010
Balance at January 1, 2010	$	198		$	—		$	25		$	223
Total pre-tax realized or unrealized losses included in earnings:
Revenue, non-regulated electric, natural gas, and other		—			—			(44	)		(44	)
Fuel used in electric generation and purchased power-non-regulated		—			—			(14	)		(14	)
Total pre-tax gains included in other comprehensive income:
Gains on available for sale securities and other		12			—			—			12
Net purchases, sales, issuances and settlement		(33	)		44			(5	)		6
Total gains included on the Condensed Consolidated Balance Sheet as regulatory asset or liability or as non-current liability		—			2			16			18
Balance at September 30, 2010	$	177		$	46		$	(22	)	$	201

Pre-tax amounts included in the Condensed Consolidated Statements of Operations related to Level 3 measurements outstanding at September 30, 2010:
Revenue, non-regulated electric, natural gas, and other	$	—	$	—	$	15		$	15
Fuel used in electric generation and purchased power-non-regulated		—		—		(1	)		(1	)
Total	$	—	$	—	$	14		$	14

Additional Fair Value Disclosure

	As of September 30, 2011
	Duke Energy				Duke Energy Carolinas				Duke Energy Ohio				Duke Energy Indiana
	Book Value(a)		Fair Value		Book Value		Fair Value		Book Value		Fair Value		Book Value		Fair Value
	(in millions)
Long-term debt, including current maturities(a)	$	19,111	$	21,346	$	8,273	$	9,469	$	2,558	$	2,685	$	3,469	$	3,977

(a) Includes Non-recourse long-term debt of variable interest entities of $959 million for Duke Energy and $300 million for Duke Energy Carolinas.

	As of December 31, 2010
	Duke Energy				Duke Energy Carolinas				Duke Energy Ohio				Duke Energy Indiana
	Book Value		Fair Value		Book Value		Fair Value		Book Value		Fair Value		Book Value		Fair Value
	(in millions)
Long-term debt, including current maturities(a)	$	18,210	$	19,484	$	7,770	$	8,376	$	2,564	$	2,614	$	3,472	$	3,746

(a) Includes Non-recourse long-term debt of variable interest entities of $976 million for Duke Energy and $300 million for Duke Energy Carolinas.