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Retirement Benefits
 3 Months Ended
Dec. 31, 2025
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
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 
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.