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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, 2025	Sep. 30, 2024
Loss Contingency Accrual [Roll Forward]
Balance as of beginning of period	$ 1,727	$ 1,751
Balance as of end of period	3,033	1,727
Uncovered Litigation
Loss Contingency Accrual [Roll Forward]
Provision for legal matters	352	322
Covered Litigation
Loss Contingency Accrual [Roll Forward]
Provision for legal matters	2,232	248
Payments on legal matters	(1,278)	(594)
U.S. Covered Litigation
Loss Contingency Accrual [Roll Forward]
Balance as of beginning of period	1,537	1,621
Provision for legal matters	2,210	140
Payments on legal matters	(1,049)	(224)
Balance as of end of period	2,698	1,537
VE Territory Covered Litigation
Loss Contingency Accrual [Roll Forward]
Balance as of beginning of period	72	110
Provision for legal matters	22	108
Payments on legal matters	(85)	(146)
Balance as of end of period	$ 9	$ 72

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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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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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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