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Legal Matters - Schedule of Accrued Litigation for Both Covered and Non-Covered Litigation (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Loss Contingency Accrual [Roll Forward]    
Balance at beginning of period $ 1,727 $ 1,751
Balance at end of period 1,649 1,471
Uncovered Litigation    
Loss Contingency Accrual [Roll Forward]    
Provision for legal matters 17 10
Covered Litigation    
Loss Contingency Accrual [Roll Forward]    
Provision for legal matters 34 22
Payments for legal matters (129) (312)
U.S. Covered Litigation    
Loss Contingency Accrual [Roll Forward]    
Balance at beginning of period 1,537 1,621
Provision for legal matters 27 0
Payments for legal matters 0 (160)
Balance at end of period 1,564 1,461
VE Territory Covered Litigation    
Loss Contingency Accrual [Roll Forward]    
Balance at beginning of period 72 110
Provision for legal matters 7 22
Payments for legal matters (21) (126)
Balance at end of period $ 58 $ 6