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Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Detail) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period	$ 1,727	$ 1,751
Balance at end of period	2,076	1,853
Uncovered Litigation
Loss Contingency Accrual [Roll Forward]
Provision for legal matters	25	310
Covered Litigation
Loss Contingency Accrual [Roll Forward]
Provision for legal matters	1,034	175
Payments for legal matters	(710)	(383)
U.S. Covered Litigation
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period	1,537	1,621
Provision for legal matters	1,019	129
Payments for legal matters	(580)	(204)
Balance at end of period	1,976	1,546
VE Territory Covered Litigation
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period	72	110
Provision for legal matters	15	46
Payments for legal matters	(24)	(144)
Balance at end of period	$ 63	$ 12

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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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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