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Pension and Other Benefit Plans (Tables)
 9 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The components of net periodic pension income were:
 
 
Three Months Ended
 
Nine Months Ended
(in millions)
 
December 31, 2018
 
December 31, 2017
 
December 31, 2018
 
December 31, 2017
Service cost
 
$
21

 
$
30

 
$
66

 
$
96

Interest cost
 
62

 
63

 
190

 
184

Expected return on assets
 
(139
)
 
(133
)
 
(426
)
 
(393
)
Amortization of prior service costs
 
(4
)
 
(5
)
 
(11
)
 
(13
)
Contractual termination benefit
 
2

 
10

 
2

 
21

Curtailment gain
 
—

 
(40
)
 
(1
)
 
(40
)
Recognition of actuarial loss
 
—

 
23

 
—

 
23

Net periodic pension income
 
$
(58
)
 
$
(52
)
 
$
(180
)
 
$
(122
)
The weighted-average rates used to determine net periodic pension cost for the three and nine months ended December 31, 2018 and December 31, 2017 were:
 
 
December 31, 2018
 
December 31, 2017
Discount or settlement rates
 
2.3
%
 
2.4
%
Expected long-term rates of return on assets
 
5.3
%
 
5.0
%
Rates of increase in compensation levels
 
2.0
%
 
2.7
%