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Pension and Other Benefit Plans (Tables)
 3 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The components of net periodic pension expense were:
 
 
Three Months Ended
(in millions)
 
June 30, 2019
 
June 30, 2018
Service cost
 
$
23

 
$
23

Interest cost
 
60

 
65

Expected return on assets
 
(161
)
 
(149
)
Amortization of prior service costs
 
(2
)
 
(1
)
Contractual termination benefit
 
11

 
—

Curtailment gain
 
—

 
(1
)
Net periodic pension income
 
$
(69
)
 
$
(63
)

The weighted-average rates used to determine net periodic pension cost were:
 
 
Three Months Ended
 
 
June 30, 2019
 
June 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
%