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Retirement Plans (Tables)
3 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost The following table contains the components of net periodic benefit cost:
Three Months Ended December 31,
(in millions)20192018
Service cost$ $ 
Interest cost  
Expected return on plan assets(5) (5) 
Net periodic benefit cost$—  $—