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Retirement Plans (Tables)
 6 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost The following table contains the components of net periodic benefit cost:
Three Months Ended
March 31,		Six Months Ended
March 31,
(in millions)2024202320242023
Service cost$2 $1 $3 $2 
Interest cost5 5 10 9 
Expected return on plan assets(3)(3)(6)(6)
Net actuarial and settlement/curtailment (gain) loss— — — 8 
Net periodic benefit cost$4 $3 $7 $13