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Pension and Other Benefit Plans
 6 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Pension and Other Benefit Plans
Pension and Other Benefit Plans

The Company offers a defined benefit pension plan, a retiree medical plan, life insurance benefits, deferred compensation plans and defined contribution plans. The Company’s defined benefit pension and retiree medical plans are not admitting new participants; therefore, changes to pension and other postretirement benefit liabilities are primarily due to market fluctuations of investments, actuarial assumptions for the measurement of liabilities and changes in interest rates.
The Company did not contribute to the defined benefit pension and other postretirement benefit plans during the three and six months ended September 30, 2019 or 2018, and does not expect to contribute during the remainder of fiscal year 2020.
The components of net periodic pension expense (benefit) were:
 
 
Three Months Ended
 
Six Months Ended
(in millions)
 
September 30, 2019
 
September 30, 2018
 
September 30, 2019
 
September 30, 2018
Service cost
 
$
—

 
$
—

 
$
1

 
$
—

Interest cost
 
5

 
5

 
9

 
6

Expected return on assets
 
(8
)
 
(7
)
 
(15
)
 
(9
)
Net periodic pension benefit
 
$
(3
)
 
$
(2
)
 
$
(5
)
 
$
(3
)


Net periodic benefit cost for the Company’s retiree medical plan was not significant for the three and six months ended September 30, 2019 or 2018.