Fair Value Of Financial Assets And Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Of Financial Assets And Liabilities [Abstract]

Fair Value Measurement Amounts For Assets And Liabilities

		December 31,			December 31,			December 31,			December 31,
	Total Fair Value Amounts at December 31, 2011			Level 1			Level 2			Level 3
	(in millions)
Description
Investments in available-for-sale auction rate securities^(a)	$	71		$	—		$	—		$	71
Nuclear decommissioning trust fund equity securities		1,337			1,285			46			6
Nuclear decommissioning trust fund debt securities		723			109			567			47
Other long-term trading and available-for-sale equity securities^(b)		68			61			7			—
Other trading and available-for-sale debt securities^(c)		382			22			360			—
Derivative assets^(b)		74			43			6			25

Total Assets	$	2,655		$	1,520		$	986		$	149
Derivative liabilities^(d)		(264	)		(82	)		(118	)		(64	)

Net Assets	$	2,391		$	1,438		$	868		$	85

(a)	Included in Other within Investments and Other Assets on the Consolidated Balance Sheets.

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

(c)	Included in Other within Investments and Other Assets and Short-term Investments on the Consolidated Balance Sheets.

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

		December 31,			December 31,			December 31,			December 31,
	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 Consolidated Balance Sheets.

(b)	Included in Other within Current Assets and Other within Investments and Other 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

Rollforward of Level 3 Measurements

		Available-fo			Available-fo			Available-fo			Available-fo
	Available-for- Sale Auction Rate Securities			Available-for- Sale NDTF Investments			Derivatives (net)			Total
Year Ended December 31, 2011
Balance at January 1, 2011	$	118		$	47		$	(19	)	$	146
Total pre-tax realized and unrealized gains (losses) included in earnings:
Revenue, regulated electric^(a)		—			—			13			13
Revenue, non-regulated electric, natural gas, and other		—			—			(27	)		(27	)
Total pre-tax gains included in other comprehensive income
Gains on available for sale securities and other		12			—			—			12
Net purchases, sales, issuances and settlements
Purchases^(a)		—			8			8			16
Sales		—			(3	)		—			(3	)
Settlements		(16	)		—			(16	)		(32	)
Total gains included on the Consolidated Balance Sheet as regulatory asset or liability or as non-current liability		—			1			2			3
Transfers out of Level 3		(43	)		—			—			(43	)

Balance at December 31, 2011	$	71		$	53		$	(39	)	$	85


(a) Derivative amounts relate to financial transmission rights

Pre-tax amounts included in the Consolidated Statements of Operations related to Level 3 measurements outstanding at December 31, 2011:
Revenue, non-regulated electric, natural gas, and other		—			—			(20	)		(20	)

Total	$	—		$	—		$	(20	)	$	(20	)

Year Ended December 31, 2010
Balance at January 1, 2010	$	198		$	—		$	25		$	223
Total pre-tax realized and unrealized losses included in earnings:
Revenue, non-regulated electric, natural gas, and other		—			—			(45	)		(45	)
Fuel used in electric generation and purchased power-non-regulated		—			—			(13	)		(13	)
Total pre-tax gains (losses) included in other comprehensive income:
Gains on available for sale securities and other		22			—			—			22
Losses on commodity cash flow hedges		—			—			(1	)		(1	)
Net purchases, sales, issuances and settlements		(102	)		45			(3	)		(60	)
Total gains included on the Consolidated Balance Sheet as regulatory asset or liability or as non-current liability		—			2			18			20

Balance at December 31, 2010	$	118		$	47		$	(19	)	$	146

Pre-tax amounts included in the Consolidated Statements of Operations related to Level 3 measurements outstanding at December 31, 2010:
Revenue, non-regulated electric, natural gas, and other	$	—		$	—		$	1		$	1

Total	$	—		$	—		$	1		$	1

Year Ended December 31, 2009
Balance at January 1, 2009	$	224		$	—		$	34		$	258
Total pre-tax realized or unrealized (losses) gains included in earnings:
Revenue, non-regulated electric, natural gas, and other		—			—			(5	)		(5	)
Fuel used in electric generation and purchased power-non-regulated		—			—			16			16
Total pre-tax (losses) gains included in other comprehensive income:
Losses on available for sale securities and other		(10	)		—			—			(10	)
Gains on commodity cash flow hedges		—			—			1			1
Net purchases, sales, issuances and settlements		(16	)		—			(7	)		(23	)
Total losses included on the Consolidated Balance Sheet as regulatory asset or liability or as non-current liability		—			—			(14	)		(14	)

Balance at December 31, 2009	$	198		$	—		$	25		$	223

Pre-tax amounts included in the Consolidated Statements of Operations related to Level 3 measurements outstanding at December 31, 2009:
Revenue, non-regulated electric, natural gas, and other	$	—		$	—		$	(14	)	$	(14	)
Fuel used in electric generation and purchased power-non-regulated		—			—			(12	)		(12	)


Total	$	—		$	—		$	(26	)	$	(26	)

Additional Fair Value Disclosure

As of December 31, 2011

Duke Energy

Duke Energy
Carolinas

Duke Energy Ohio

Duke Energy Indiana

Book
Value^(a)

Approximate
Fair Value

Book
Value^(a)

Approximate
Fair Value

Book
Value

Approximate
Fair Value

Book
Value

Approximate
Fair Value

(in millions)

Long-term debt, including current maturities

20,573

23,053

9,274

10,629

2,555

2,688

3,459

4,048

(a)	Includes Non-recourse long-term debt of variable interest entities of $949 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		Approximate Fair Value		Book Value		Approximate Fair Value		Book Value		Approximate Fair Value		Book Value		Approximate 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.

- 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, 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, issuances, 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

- Definition

Tabular disclosure of the fair value measurement of assets and liabilities which includes [financial] instruments measured at fair value that are classified in stockholders' equity. Such assets and liabilities may be measured on a recurring or nonrecurring basis. The disclosures which may be required or desired include: (1) for assets and liabilities measured on a recurring basis, disclosure may include: (a) the fair value measurements at the reporting date; (b) the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3); (c) for fair value measurements using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (i) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), 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); (ii) purchases, sales, issuances, and settlements (net); (iii) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs); (d) the amount of the total gains or losses for the period in subparagraph (c) (i) above included in earnings (or changes in net assets) that are attributable to the change in unrealized gains or losses relating to those assets and liabilities still held at the reporting date and a description of where those unrealized gains or losses are reported in the statement of income (or activities); (e) the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period and (2) for assets and liabilities that are measured at fair value on a nonrecurring basis (for example, impaired assets) disclosure may include, in addition to (a) above: (a) the reasons for the fair value measurements recorded; (b) the same as (b) above; (c) for fair value measurements using significant unobservable inputs (Level 3), a description of the inputs and the information used to develop the inputs; and (d) the valuation technique(s) used to measure fair value and a discussion of changes, if any, in the valuation technique(s) used to measure similar assets and/or liabilities in prior periods. Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19279-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 33

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 6

-Footnote 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258

+ Details