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Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period		$ 1,456	$ 983
Balance at end of period	$ 1,545	1,545	1,486
Uncovered Litigation
Loss Contingency Accrual [Roll Forward]
Provision for legal matters		1	2
Covered Litigation
Loss Contingency Accrual [Roll Forward]
Provision for legal matters		808	878
Payments for legal matters		(720)	(377)
U.S. Covered Litigation
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period		1,441	881
Provision for legal matters	456	797	861
Payments for legal matters		(699)	(262)
Balance at end of period	1,539	1,539	1,480
VE Territory Covered Litigation
Loss Contingency Accrual [Roll Forward]
Balance at beginning of period		11	102
Provision for legal matters		11	17
Payments for legal matters		(19)	(114)
Balance at end of period	$ 3	$ 3	$ 5

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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