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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
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | $ 983 | $ 914
Balance at end of period | 1,456 | 983
Uncovered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 6 | 4
Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Provision for legal matters | 885 | 125
Payments on legal matters | (418) | (60)
U.S. Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 881 | 888
Provision for legal matters | 861 |
Payments on legal matters | (301) | (7)
Balance at end of period | 1,441 | 881
VE Territory Covered Litigation |  |
Loss Contingency Accrual [Roll Forward] |  |
Balance at beginning of period | 102 | 21
Provision for legal matters | 24 | 125
Payments on legal matters | (115) | (44)
Balance at end of period | $ 11 | $ 102

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