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Restructuring and Related Costs - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Restructuring Reserve [Roll Forward]
Additional restructuring and related costs	$ 106	$ 81	$ 399	$ 844
Various 2023 Restructuring Plans
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			105
Additional restructuring and related costs	40		103		$ 276
Utilized—cash			(133)		(130)
Utilized—noncash			(37)		(41)
Other			32
Restructuring reserve, ending balance	70		70		105
Employee Severance and Termination Benefits | Various 2023 Restructuring Plans
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			93
Additional restructuring and related costs			50		204
Utilized—cash			(121)		(111)
Utilized—noncash			0		0
Other			32
Restructuring reserve, ending balance	54		54		93
Long-Lived Asset Impairments | Various 2023 Restructuring Plans
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			0
Additional restructuring and related costs			36		38
Utilized—cash			0		0
Utilized—noncash			(36)		(38)
Other
Restructuring reserve, ending balance	0		0		0
Other | Various 2023 Restructuring Plans
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			12
Additional restructuring and related costs			17		34
Utilized—cash			(12)		(19)
Utilized—noncash			(1)		(3)
Other			0
Restructuring reserve, ending balance	$ 16		$ 16		$ 12

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- Definition

Restructuring Costs, Other

+ References

No definition available.

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

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- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of decrease in the reserve for full or partial settlement through consideration other than cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4.b.2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

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