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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, 2025 | Sep. 30, 2024
Loss Contingency Accrual [Roll Forward] |  |
Balance as of beginning of period | $ 1,727 | $ 1,751
Balance as of end of period | 3,033 | 1,727
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 352 | 322
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 2,232 | 248
Payments on legal matters | (1,278) | (594)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance as of beginning of period | 1,537 | 1,621
Provision for legal matters | 2,210 | 140
Payments on legal matters | (1,049) | (224)
Balance as of end of period | 2,698 | 1,537
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance as of beginning of period | 72 | 110
Provision for legal matters | 22 | 108
Payments on legal matters | (85) | (146)
Balance as of end of period | $ 9 | $ 72

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