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Pension and Other Benefit Plans (Tables)
 6 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The weighted-average rates used to determine net periodic pension cost for the three and six months ended September 30, 2019 and September 30, 2018 were:
 
 
September 30, 2019
 
September 30, 2018
Discount or settlement rates
 
2.4
%
 
2.3
%
Expected long-term rates of return on assets
 
5.8
%
 
5.3
%
Rates of increase in compensation levels
 
2.0
%
 
2.1
%


The components of net periodic pension income were:
 
 
Three Months Ended
 
Six Months Ended
(in millions)
 
September 30, 2019
 
September 30, 2018
 
September 30, 2019
 
September 30, 2018
Service cost
 
$
23

 
$
22

 
$
46

 
$
45

Interest cost
 
57

 
63

 
117

 
128

Expected return on assets
 
(154
)
 
(138
)
 
(315
)
 
(287
)
Amortization of prior service costs
 
(2
)
 
(6
)
 
(4
)
 
(7
)
Contractual termination benefit
 
6

 
—

 
17

 
—

Curtailment gain
 
—

 
—

 
—

 
(1
)
Net periodic pension income
 
$
(70
)
 
$
(59
)
 
$
(139
)
 
$
(122
)