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Retirement Plans (Tables)
9 Months Ended
Jun. 30, 2021
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)2021202020212020
Service cost$$$$
Interest cost
Expected return on plan assets(6)(4)(14)(14)
Net actuarial and settlement (gain) loss(1)(1)
Net periodic benefit cost$(2)$$(2)$