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Legal Matters - Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Loss Contingency Accrual [Roll Forward]
Balance as of beginning of period	$ 1,456	$ 983
Balance as of end of period	1,751	1,456
Uncovered Litigation
Loss Contingency Accrual [Roll Forward]
Provision for legal matters	21	6
Covered Litigation
Loss Contingency Accrual [Roll Forward]
Provision for legal matters	1,024	885
Payments on legal matters	(750)	(418)
U.S. Covered Litigation
Loss Contingency Accrual [Roll Forward]
Balance as of beginning of period	1,441	881
Provision for legal matters	906
Payments on legal matters	(726)	(301)
Balance as of end of period	1,621	1,441
VE Territory Covered Litigation
Loss Contingency Accrual [Roll Forward]
Balance as of beginning of period	11	102
Provision for legal matters	118	24
Payments on legal matters	(19)	(115)
Balance as of end of period	$ 110	$ 11

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-10

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- Definition

Amount of cash outflow reducing loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-1

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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-1

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