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Retirement Benefits (Tables)
 9 Months Ended
Jun. 30, 2026
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension and Postretirement Benefit Cost
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,
2026202520262025
Service cost$10 $10 $28 $31 
Interest cost34 34 103 102 
Expected return on plan assets(42)(42)(127)(125)
Amortization of net actuarial loss3 7 11 20 
Net periodic pension benefit cost$5 $9 $15 $28 
Other Postretirement Benefits
Three Months Ended
June 30,		Nine Months Ended
June 30,
2026202520262025
Service cost$— $— $1 $— 
Interest cost— 1 1 1 
Amortization of net actuarial loss1 — 2 2 
Net periodic postretirement benefit cost$1 $1 $4 $3