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Asset Retirement Obligations Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Asset Retirement Obligations
Increase in ARO liability	$ 199
Accretion expense	40
Balance	3,289		3,138
Settlements (ash storage areas)	(37)		(22)
Accretion (recorded as regulatory asset)	170		172
Additional obligations	0		2
Change in estimate	66		(1)
Balance	3,488	[1]	3,289
Current portion of ARO	16
Nuclear
Asset Retirement Obligations
Balance	2,208		2,091
Settlements (ash storage areas)	0		0
Accretion (recorded as regulatory asset)	125		117
Additional obligations	0		0
Change in estimate	66		0
Balance	2,399		2,208
Non-nuclear
Asset Retirement Obligations
Balance	1,081		1,047
Settlements (ash storage areas)	(37)		(22)
Accretion (recorded as regulatory asset)	45		55
Additional obligations	0		2
Change in estimate	0		(1)
Balance	$ 1,089		$ 1,081
[1] The current portion of ARO in the amount of $16 million is included in Accounts payable and accrued liabilities.

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The amount of accretion recorded as a regulatory asset during the period.

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Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848



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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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-Paragraph 1

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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Net Increase or Decrease in the asset retirement obligation during the period.

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Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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