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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
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Sep. 30, 2024 | Sep. 30, 2023
Loss Contingency Accrual [Roll Forward] |  |
Balance as of beginning of period | $ 1,751 | $ 1,456
Balance as of end of period | 1,727 | 1,751
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 322 | 21
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 248 | 1,024
Payments on legal matters | (594) | (750)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance as of beginning of period | 1,621 | 1,441
Provision for legal matters | 140 | 906
Payments on legal matters | (224) | (726)
Balance as of end of period | 1,537 | 1,621
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance as of beginning of period | 110 | 11
Provision for legal matters | 108 | 118
Payments on legal matters | (146) | (19)
Balance as of end of period | $ 72 | $ 110

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