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Pension Benefits Pension Benefits (Tables)
 6 Months Ended
Sep. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of Net Pension Costs
The net periodic expense for our pension plans, which includes net pension expense for Celesio in 2015, is as follows:
 
U.S. Plans
 
Non-U.S. Plans
 
U.S. Plans
 
Non-U.S. Plans
 
Quarter Ended
September 30,
 
Quarter Ended
September 30,
 
Six Months Ended
September 30,
 
Six Months Ended
September 30,
(In millions)
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost - benefits earned during the year
$
—

 
$
1

 
$
5

 
$
1

 
$
1

 
$
2

 
$
9

 
$
2

Interest cost on projected benefit obligation
4

 
5

 
9

 
2

 
9

 
10

 
18

 
3

Expected return on assets
(5
)
 
(5
)
 
(8
)
 
(2
)
 
(11
)
 
(10
)
 
(15
)
 
(4
)
Amortization of unrecognized actuarial loss, prior service costs and net transitional obligation
6

 
7

 
1

 
1

 
10

 
16

 
2

 
2

Net periodic pension expense
$
5

 
$
8

 
$
7

 
$
2

 
$
9

 
$
18

 
$
14

 
$
3