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Employee Benefit Plans
 3 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Employee Benefit Plans EMPLOYEE BENEFIT PLANS
The following table summarizes the components of pension and other postretirement benefit income:

Other postretirement benefits
Pension benefits
(In millions)2019201820192018
Three months ended December 31
Service cost$1  $—  $—  $—  
Interest cost16  20  —  1  
Expected return on plan assets(22) (20) —  —  
Amortization of prior service credit—  —  (3) (3) 
Net periodic benefit income$(5) $—  $(3) $(2)