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Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | $ 1,727 | $ 1,751
Balance at end of period | 2,352 | 1,688
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 114 | 311
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 1,564 | 201
Payments for legal matters | (1,053) | (575)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 1,537 | 1,621
Provision for legal matters | 1,545 | 140
Payments for legal matters | (827) | (204)
Balance at end of period | 2,255 | 1,557
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 72 | 110
Provision for legal matters | 19 | 61
Payments for legal matters | (85) | (146)
Balance at end of period | $ 6 | $ 25

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