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Asset Retirement Obligations (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2022	Sep. 30, 2021
Asset Retirement Obligations
Asset Retirement Obligation, Period Increase (Decrease)	$ 193
Amortization and Depreciation of Decontaminating and Decommissioning Assets	69
Asset Retirement Obligation, Beginning Balance	7,002
Settlements	(125)
Asset Retirement Obligation, Revision of Estimate	207
Accretion (recorded as regulatory asset)	111
Asset Retirement Obligation, Ending Balance	7,195
Current portion of ARO	(332)	$ (266)
Revision in estimate due to new depreciation rates	47
Revisions in estimate due to coal fines	119
Revision in ARO due to coal yards	57
Nuclear
Asset Retirement Obligations
Asset Retirement Obligation, Beginning Balance	3,428
Settlements	0
Asset Retirement Obligation, Revision of Estimate	3
Accretion (recorded as regulatory asset)	78
Asset Retirement Obligation, Ending Balance	3,509
Non-nuclear
Asset Retirement Obligations
Asset Retirement Obligation, Beginning Balance	3,574
Settlements	(125)
Asset Retirement Obligation, Revision of Estimate	204
Accretion (recorded as regulatory asset)	33
Asset Retirement Obligation, Ending Balance	$ 3,686

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

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Reconciliation of Asset Retirement Obligations [Line Items]

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Revision in ARO due to coal yards

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Revision in estimate due to new depreciation rates

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Revisions in estimate due to coal fines

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- Definition

The current period expense charged against earnings on decontaminating and decommissioning of facilities used in the normal conduct of business and not intended for resale to allocate or recognize the cost of the assets over their useful lives.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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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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-SubTopic 20
-Section 50
-Paragraph 1
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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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-SubTopic 20
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Amount of increase (decrease) in asset retirement obligations.

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-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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-Topic 410
-SubTopic 20
-Section 35
-Paragraph 8
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