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Retirement Benefit Plans (Tables)
 9 Months Ended
Jan. 25, 2013
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Benefit Costs
The net periodic benefit cost of the plans includes the following components for the three and nine months ended January 25, 2013 and January 27, 2012:
 
U.S. Pension Benefits
 
Non-U.S. Pension Benefits
 
Post-Retirement Benefits
 
Three months ended
 
Three months ended
 
Three months ended
(in millions)
January 25,
2013
 
January 27,
2012 (a)
 
January 25,
2013
 
January 27,
2012 (a)
 
January 25,
2013
 
January 27,
2012 (a)
Service cost
$
26

 
$
23

 
$
11

 
$
11

 
$
5

 
$
5

Interest cost
23

 
22

 
7

 
7

 
4

 
4

Expected return on plan assets
(32
)
 
(30
)
 
(8
)
 
(9
)
 
(4
)
 
(4
)
Amortization of net actuarial loss
18

 
11

 
2

 
1

 
1

 
1

Net periodic benefit cost
$
35

 
$
26

 
$
12

 
$
10

 
$
6

 
$
6

 
U.S. Pension Benefits
 
Non-U.S. Pension Benefits
 
Post-Retirement Benefits
 
Nine months ended
 
Nine months ended
 
Nine months ended
(in millions)
January 25,
2013
 
January 27,
2012 (a)
 
January 25,
2013
 
January 27,
2012 (a)
 
January 25,
2013
 
January 27,
2012 (a)
Service cost
$
78

 
$
69

 
$
33

 
$
33

 
$
15

 
$
15

Interest cost
69

 
66

 
21

 
21

 
12

 
12

Expected return on plan assets
(96
)
 
(90
)
 
(24
)
 
(27
)
 
(12
)
 
(12
)
Amortization of net actuarial loss
54

 
33

 
6

 
3

 
3

 
3

Net periodic benefit cost
$
105

 
$
78

 
$
36

 
$
30

 
$
18

 
$
18

(a) Components of the net periodic benefit cost for the three and nine months ended January 27, 2012 include balances related to Physio-Control.