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Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Detail) - USD ($) $ in Millions | 6 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | $ 1,751 | $ 1,456
Balance at end of period | 1,853 | 1,602
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 310 | 0
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 175 | 352
Payments for legal matters | (383) | (206)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 1,621 | 1,441
Provision for legal matters | 129 | 341
Payments for legal matters | (204) | (201)
Balance at end of period | 1,546 | 1,581
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 110 | 11
Provision for legal matters | 46 | 11
Payments for legal matters | (144) | (5)
Balance at end of period | $ 12 | $ 17

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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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