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Legal Matters - Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Loss Contingency Accrual [Roll Forward] |  |
Balance as of beginning of period | $ 1,456 | $ 983
Balance as of end of period | 1,751 | 1,456
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 21 | 6
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 1,024 | 885
Payments on legal matters | (750) | (418)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance as of beginning of period | 1,441 | 881
Provision for legal matters | 906 |
Payments on legal matters | (726) | (301)
Balance as of end of period | 1,621 | 1,441
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance as of beginning of period | 11 | 102
Provision for legal matters | 118 | 24
Payments on legal matters | (19) | (115)
Balance as of end of period | $ 110 | $ 11

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