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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