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Retirement Benefits (Tables)
 9 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic pension and postretirement benefit cost were (in millions):
 Pension Benefits
 Three Months Ended
June 30,		Nine Months Ended
June 30,
 2025202420252024
Service cost$10 $8 $31 $27 
Interest cost34 37 102 110 
Expected return on plan assets(42)(42)(125)(127)
Amortization of net actuarial loss7 — 20 — 
Net periodic pension benefit cost$9 $3 $28 $10 
 Other Postretirement Benefits
 Three Months Ended
June 30,		Nine Months Ended
June 30,
 2025202420252024
Service cost$— $1 $— $1 
Interest cost1 1 1 2 
Amortization of net actuarial loss— — 2 1 
Net periodic postretirement benefit cost$1 $2 $3 $4