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Retirement Benefits (Tables)
 3 Months Ended
Dec. 31, 2024
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
December 31,
 20242023
Service cost$10 $10 
Interest cost34 36 
Expected return on plan assets(41)(42)
Amortization of net actuarial loss6 — 
Net periodic pension benefit cost$9 $4 
 Other Postretirement Benefits
 Three Months Ended
December 31,
 20242023
Service cost$— $— 
Interest cost— 1 
Amortization of net actuarial loss1 — 
Net periodic postretirement benefit cost$1 $1