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Pension Benefits Pension Benefits (Tables)
 9 Months Ended
Dec. 31, 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 December 31,
 
Quarter Ended December 31,
 
Nine Months Ended December 31,
 
Nine Months Ended December 31,
(In millions)
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost - benefits earned during the year
$
—

 
$
1

 
$
4

 
$
—

 
$
1

 
$
3

 
$
13

 
$
2

Interest cost on projected benefit obligation
5

 
5

 
8

 
2

 
14

 
15

 
26

 
5

Expected return on assets
(5
)
 
(5
)
 
(8
)
 
(2
)
 
(16
)
 
(15
)
 
(23
)
 
(6
)
Amortization of unrecognized actuarial loss, prior service costs and net transitional obligation
5

 
8

 
1

 
1

 
15

 
24

 
3

 
3

Curtailment loss (gain)
—

 
—

 
5

 
(1
)
 
—

 
—

 
5

 
(1
)
Net periodic pension expense
$
5

 
$
9

 
$
10

 
$
—

 
$
14

 
$
27

 
$
24

 
$
3