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Pension and Postretirement Plans (Tables)
 6 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of the Company’s net periodic benefit cost (credit) associated with its defined benefit pension and postretirement plans, which are primarily recorded in selling, general and administrative expenses in the consolidated statements of income, are shown in the tables below in accordance with ASC 715, "Compensation – Retirement Benefits" (in millions):
 U.S. Pension Plans
Three Months Ended
March 31,		Six Months Ended
March 31,
 2024202320242023
Interest cost$19 $20 $39 $41 
Expected return on plan assets(30)(33)(60)(67)
Net actuarial loss— 15 — 23 
Settlement loss— 1 — 1 
Net periodic benefit cost (credit)$(11)$3 $(21)$(2)
 Non-U.S. Pension Plans
Three Months Ended
March 31,		Six Months Ended
March 31,
 2024202320242023
Service cost$4 $4 $8 $7 
Interest cost17 17 34 33 
Expected return on plan assets(18)(19)(36)(37)
Net periodic benefit cost$3 $2 $6 $3 

 Postretirement Benefits
Three Months Ended
March 31,		Six Months Ended
March 31,
 2024202320242023
Interest cost$1 $1 $2 $2 
Expected return on plan assets(2)(2)(4)(4)
Amortization of prior service credit(2)(1)(3)(2)
Net periodic benefit credit$(3)$(2)$(5)$(4)