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Pension and Other Benefit Plans (Tables)
 3 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The components of net periodic pension expense were:
 
 
Three Months Ended
(in millions)
 
June 30, 2017
 
July 1, 2016
Service cost
 
$
32

 
$
6

Interest cost
 
60

 
21

Expected return on assets
 
(128
)
 
(43
)
Amortization of prior service costs
 
(4
)
 
(5
)
Contractual termination benefit
 
9

 
—

Net periodic pension expense (income)
 
$
(31
)
 
$
(21
)


The weighted-average rates used to determine net periodic pension cost were:
 
 
Three Months Ended
 
 
June 30, 2017
 
July 1, 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
%