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Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | $ 3,033 | $ 1,727
Balance at end of period | 981 | 2,076
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 143 | 25
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 915 | 1,034
Payments for legal matters | (3,110) | (710)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 2,698 | 1,537
Provision for legal matters | 894 | 1,019
Payments for legal matters | (2,977) | (580)
Balance at end of period | 615 | 1,976
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 9 | 72
Provision for legal matters | 21 | 15
Payments for legal matters | (9) | (24)
Balance at end of period | $ 21 | $ 63

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