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Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Detail) - USD ($) $ in Millions | 9 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | $ 1,751 | $ 1,456
Balance at end of period | 1,688 | 1,545
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 311 | 1
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 201 | 808
Payments for legal matters | (575) | (720)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 1,621 | 1,441
Provision for legal matters | 140 | 797
Payments for legal matters | (204) | (699)
Balance at end of period | 1,557 | 1,539
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 110 | 11
Provision for legal matters | 61 | 11
Payments for legal matters | (146) | (19)
Balance at end of period | $ 25 | $ 3

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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 + Details
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