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Restructuring and Related Costs - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2023
Restructuring Reserve [Roll Forward]
Additional restructuring and related costs	$ 254	$ 418	$ 293	$ 763
Various 2023 Restructuring Plans
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			105
Additional restructuring and related costs	24		63		$ 276
Utilized—cash			(90)		(130)
Utilized—noncash			(24)		(41)
Other			28
Restructuring reserve, ending balance	82		82		105
Employee Severance and Termination Benefits | Various 2023 Restructuring Plans
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			93
Additional restructuring and related costs			34		204
Utilized—cash			(84)		(111)
Utilized—noncash			0		0
Other			28
Restructuring reserve, ending balance	71		71		93
Long-Lived Asset Impairments | Various 2023 Restructuring Plans
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			0
Additional restructuring and related costs			23		38
Utilized—cash			0		0
Utilized—noncash			(23)		(38)
Other			0
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			6		34
Utilized—cash			(6)		(19)
Utilized—noncash			(1)		(3)
Other			0
Restructuring reserve, ending balance	$ 11		$ 11		$ 12

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Restructuring Costs, Other

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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 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/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

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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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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 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/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

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