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Risk Management Activities and Derivative Transactions Mark-to-Market Values of TVA Derivatives (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
200 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	$ (40)	$ (44)
250 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(11)	(24)
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(53)	(63)
$1.0 billion notional swaption | Other long-term liabilities
Derivatives, Fair Value
Fair value	0	(1,077)
$1.0 billion notional interest rate swap
Derivatives, Fair Value
Fair value		0
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(1,258)
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(465)	(446)
$42 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(18)	(17)
Commodity contract derivatives
Derivatives, Fair Value
Fair value	(331)	239
Commodity contract derivatives | Other long-term assets
Derivatives, Fair Value
Fair value	111	285
Commodity contract derivatives | Other long-term liabilities
Derivatives, Fair Value
Fair value	(236)	(119)
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value	10	150
Commodity contract derivatives | Accounts payable and accrued liabilities
Derivatives, Fair Value
Fair value	(216)	(77)
Margin cash account | Other current assets
Derivatives, Fair Value
Collateral already posted	26	26
Fair value	79	34
Derivatives Under FTP
Derivatives, Fair Value
Fair value	(391)	(234)
Derivatives Under FTP | Current regulatory assets
Derivatives, Fair Value
Fair value	(186)	(135)
Derivatives Under FTP | Regulatory assets
Derivatives, Fair Value
Fair value	(210)	(102)
Derivatives Under FTP | Current regulatory liabilities
Derivatives, Fair Value
Fair value	3	3
Derivatives Under FTP | Regulatory liabilities
Derivatives, Fair Value
Fair value	$ 2	$ 0

X

- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44D

-Subparagraph c

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611

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