v3.26.1
Retirement Benefits
 6 Months Ended
Mar. 31, 2026
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits
The components of net periodic pension and postretirement benefit cost were (in millions):
 Pension Benefits
 Three Months Ended
March 31,
Six Months Ended
March 31,
 2026202520262025
Service cost$9 $11 $18 $21 
Interest cost35 34 69 68 
Expected return on plan assets(43)(42)(85)(83)
Amortization of net actuarial loss4 7 8 13 
Net periodic pension benefit cost$5 $10 $10 $19 
 Other Postretirement Benefits
 Three Months Ended
March 31,
Six Months Ended
March 31,
 2026202520262025
Service cost$1 $— $1 $— 
Interest cost1 — 1 — 
Amortization of net actuarial loss— 1 1 2 
Net periodic postretirement benefit cost$2 $1 $3 $2 
The service cost component is included in Cost of sales, Selling, general and administrative expenses, and Engineering and development in the Consolidated Statement of Operations. All other components are included in Other income in the Consolidated Statement of Operations.