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Pension and Other Benefit Plans (Tables)
 6 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The components of net periodic pension expense were:
 
 
Three Months Ended
 
Six Months Ended
(in millions)
 
September 30, 2017
 
September 30, 2016
 
September 30, 2017
 
September 30, 2016
Service cost
 
$
34

 
$
5

 
$
66

 
$
11

Interest cost
 
61

 
21

 
121

 
42

Expected return on assets
 
(132
)
 
(40
)
 
(260
)
 
(83
)
Amortization of prior service costs
 
(4
)
 
(4
)
 
(8
)
 
(9
)
Contractual termination benefit
 
2

 
—

 
11

 
—

Net periodic pension expense (income)
 
$
(39
)
 
$
(18
)
 
$
(70
)
 
$
(39
)


The weighted-average rates used to determine net periodic pension cost for the three and six months ended September 30, 2017 and September 30, 2016 were:
 
 
September 30, 2017
 
September 30, 2016
Discount or settlement rates
 
2.5
%
 
3.1
%
Expected long-term rates of return on assets
 
4.9
%
 
6.3
%
Rates of increase in compensation levels
 
2.7
%
 
2.6
%