Risk Management, Derivative Instruments And Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2011

Risk Management, Derivative Instruments And Hedging Activities [Abstract]

Notional Amounts Of Derivative Instruments Related To Interest Rate Risk

	Duke Energy		Duke Energy Carolinas		Duke Energy Ohio		Duke Energy Indiana
	(in millions)
Cash Flow Hedges(a)	$	841	$	—	$	—	$	—
Undesignated Contracts		247		—		27		200
Fair Value Hedges		275		25		250		—
Total Notional Amount at December 31, 2011	$	1,363	$	25	$	277	$	200

	Duke Energy		Duke Energy Carolinas		Duke Energy Ohio
	(in millions)
Cash Flow Hedges(a)	$	492	$	—	$	—
Undesignated Contracts		561		500		27
Fair Value Hedges		275		25		250
Total Notional Amount at December 31, 2010	$	1,328	$	525	$	277

(a) Includes amounts related to non-recourse variable rate long-term debt of VIEs of $466 million at December 31, 2011 and $492 million at December 31, 2010.

Underlying Notional Amounts For Derivative Instruments Accounted For At Fair Value

Duke Energy	December 31, 2011		December 31, 2010
Electricity-energy (Gigawatt-hours)		14,118		8,200
Electricity-capacity (Gigawatt-months)		—		58
Emission allowances: SO2 (thousands of tons)		—		8
Emission allowances: NOX (thousands of tons)		9		—
Natural gas (millions of decatherms)		40		37

Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets

Duke Energy	December 31, 2011				December 31, 2010
	Asset		Liability		Asset		Liability
	(in millions)
Derivatives Designated as Hedging Instruments
Interest rate contracts
Current Assets: Other		4		—		5		—
Investments and Other Assets: Other		2		—		16		—
Current Liabilities: Other		—		11		—		13
Deferred Credits and Other Liabilities: Other		—		76		—		—
Total Derivatives Designated as Hedging Instruments	$	6	$	87	$	21	$	13
Derivatives Not Designated as Hedging Instruments
Commodity contracts
Current Assets: Other	$	81	$	31	$	108	$	54
Investments and Other Assets: Other		35		17		55		4
Current Liabilities: Other		136		168		75		118
Deferred Credits and Other Liabilities: Other		25		93		3		72
Interest rate contracts
Investments and Other Assets: Other(a)		—		—		60		—
Current Liabilities: Other		—		2		—		2
Deferred Credits and Other Liabilities: Other(b)		—		75		—		5
Total Derivatives Not Designated as Hedging Instruments	$	277	$	386	$	301	$	255
Total Derivatives	$	283	$	473	$	322	$	268

(a) Balance relates to interest rate swaps at Duke Energy Carolinas which receive regulatory accounting treatment.

(b) As of December 31, 2011, includes $67 million related to interest rate swaps at Duke Energy Indiana which receive regulatory accounting treatment.

Cash Flow Hedges-Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Comprehensive Income

		$0,000			$0,000
Duke Energy	Year Ended December 31,
	2011			2010
	(in millions)
Amount of Pre-tax (Losses) Gains Recorded in AOCI
Interest rate contracts		(88	)		2
Total Pre-tax (Losses) Gains Recorded in AOCI	$	(88	)	$	2
Location of Pre-tax Gains (Losses) Reclassified from AOCI into Earnings
Commodity contracts
Fuel used in electric generation and purchased power-non-regulated		—			2
Interest rate contracts
Interest expense		(5	)		(5	)
Total Pre-tax Losses Reclassified from AOCI into Earnings	$	(5	)	$	(3	)

Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities

Duke Energy	Year Ended December 31,
	2011			2010
	(in millions)
Location of Pre-Tax Gains and (Losses) Recognized in Earnings
Commodity contracts
Revenue, regulated electric	$	—		$	1
Revenue, non-regulated electric, natural gas and other		(59	)		(38	)
Fuel used in electric generation and purchased power-non-regulated		(1	)		9
Total Pre-tax Losses Recognized in Earnings	$	(60	)	$	(28	)
Location of Pre-Tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities
Commodity contracts
Regulatory Asset	$	(1	)	$	5
Regulatory Liability		17			14
Interest rate contracts
Regulatory Asset(a)		(165	)		(1	)
Regulatory Liability(b)		(60	)		60
Total Pre-tax (Losses) Gains Recognized as Regulatory Assets or Liabilities	$	(209	)	$	78

(a) Includes losses related to interest rate swaps at Duke Energy Carolinas and Duke Energy Indiana of $94 million and $67 million, respectively, during the year ended December 31, 2011.

(b) Amounts relate to interest rate swaps at Duke Energy Carolinas.

Schedule Of Information Regarding Derivative Instruments that Contain Credit-risk Related Contingent

Duke Energy	December 31, 2011		December 31, 2010
	(in millions)
Aggregate Fair Value Amounts of Derivative Instruments in a Net Liability Position	$	96	$	148
Collateral Already Posted	$	36	$	2
Additional Cash Collateral or Letters of Credit in the Event Credit-risk-related Contingent Features were Triggered at the End of the Reporting Period	$	5	$	14

Schedule Of Derivatives In Net Liability Position

	December 31, 2011				December 31, 2010
	(in millions)				(in millions)
Duke Energy	Receivables		Payables		Receivables		Payables
Amounts offset against net derivative positions on the Consolidated Balance Sheets	$	10		—	$	2		—
Amounts not offset against net derivative positions on the Consolidated Balance Sheets(a)		30		—		2		3
	December 31, 2011				December 31, 2010
	(in millions)				(in millions)
Duke Energy Ohio	Receivables		Payables		Receivables		Payables
Amounts offset against net derivative positions on the Consolidated Balance Sheets	$	9		—	$	2		—
Amounts not offset against net derivative positions on the Consolidated Balance Sheets (a)		28	$	—		—		3

(a) Amounts primarily represent margin deposits related to futures contracts.