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Retirement Plans (Tables)
 9 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost The following table contains the components of net periodic benefit cost:
Three Months Ended
June 30,		Nine Months Ended
June 30,
(in millions)2024202320242023
Service cost$1 $2 $4 $4 
Interest cost4 4 14 13 
Expected return on plan assets(3)(3)(9)(9)
Net actuarial and settlement/curtailment (gain) loss— — — 8 
Net periodic benefit cost$2 $3 $9 $16