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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, 2023 | Mar. 31, 2022
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | $ 1,456 | $ 983
Balance at end of period | 1,602 | 769
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 0 | 1
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 352 | 150
Payments for legal matters | (206) | (365)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 1,441 | 881
Provision for legal matters | 341 | 145
Payments for legal matters | (201) | (262)
Balance at end of period | 1,581 | 764
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 11 | 102
Provision for legal matters | 11 | 5
Payments for legal matters | (5) | (102)
Balance at end of period | $ 17 | $ 5

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