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Retirement Benefits (Tables)
 3 Months Ended
Dec. 31, 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
December 31,
 20252024
Service cost$9 $10 
Interest cost34 34 
Expected return on plan assets(42)(41)
Amortization of net actuarial loss4 6 
Net periodic pension benefit cost$5 $9 
 Other Postretirement Benefits
 Three Months Ended
December 31,
 20252024
Amortization of net actuarial loss$1 $1 
Net periodic postretirement benefit cost$1 $1