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Retirement Benefit Plans (Tables)
 6 Months Ended
Oct. 26, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The net periodic benefit cost of the defined benefit pension plans included the following components for the three and six months ended October 26, 2018 and October 27, 2017:
 
U.S.
 
Non-U.S.
 
Three months ended
 
Three months ended
(in millions)
October 26, 2018
 
October 27, 2017
 
October 26, 2018
 
October 27, 2017
Service cost
$
27

 
$
29

 
$
15

 
$
17

Interest cost
33

 
30

 
7

 
7

Expected return on plan assets
(54
)
 
(52
)
 
(14
)
 
(13
)
Amortization of net actuarial loss
19

 
20

 
3

 
4

Net periodic benefit cost
$
25

 
$
27

 
$
11

 
$
15



 
U.S.
 
Non-U.S.
 
Six months ended
 
Six months ended
(in millions)
October 26, 2018
 
October 27, 2017
 
October 26, 2018
 
October 27, 2017
Service cost
$
54

 
$
58

 
$
30

 
$
34

Interest cost
66

 
60

 
14

 
14

Expected return on plan assets
(108
)
 
(104
)
 
(28
)
 
(26
)
Amortization of net actuarial loss
38

 
40

 
6

 
8

Net periodic benefit cost
$
50

 
$
54

 
$
22

 
$
30