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Commitments and Contingencies - Leases (Details) - USD ($) $ in Millions		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Leases
Estimated future decommissioning cost	[1]	$ 7,489	$ 7,162	$ 7,002
[1] (1) Includes $272 million and $275 million at September 30, 2023 and 2022, respectively, in Current liabilities.

X

- Definition

Leases [Line Items]

+ References

No definition available.

+ Details

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481999/410-20-25-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481850/410-20-50-1

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