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Benefit Plans (Detail) - Pension Plans - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 12 $ 25
Interest cost 42 39
Expected return on plan assets (56) (42)
Amortization of prior service credit 0 (1)
Amortization of loss 10 16
Net pension cost $ 8 $ 37