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Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | $ 3,033 | $ 1,727
Balance at end of period | 3,406 | 1,649
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 1 | 17
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 707 | 34
Payments for legal matters | (335) | (129)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 2,698 | 1,537
Provision for legal matters | 707 | 27
Payments for legal matters | (207) | 0
Balance at end of period | 3,198 | 1,564
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 9 | 72
Provision for legal matters | 0 | 7
Payments for legal matters | (4) | (21)
Balance at end of period | $ 5 | $ 58

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