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Postretirement Benefits (Tables)
 12 Months Ended
Mar. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of net periodic expense for postretirement welfare benefits
The net periodic expense for our pension plans, which includes net pension expense of Celesio beginning February 2014, is as follows:
 
U.S. Plans
 
Non-U.S. Plans
 
Years Ended March 31,
 
Years Ended March 31,
(In millions)
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Service cost - benefits earned during the year
$
4

 
$
1

 
$
4

 
$
20

 
$
16

 
$
6

Interest cost on projected benefit obligation
18

 
19

 
19

 
24

 
34

 
11

Expected return on assets
(19
)
 
(21
)
 
(20
)
 
(30
)
 
(30
)
 
(12
)
Amortization of unrecognized actuarial loss, prior service costs and net transitional obligation
42

 
19

 
32

 
3

 
3

 
4

Curtailment/settlement loss (gain)
2

 
—

 
—

 
—

 
6

 
(1
)
Net periodic pension expense
$
47

 
$
18

 
$
35

 
$
17

 
$
29

 
$
8

The net periodic expense for our postretirement welfare benefits is as follows:
 
Years Ended March 31,
(In millions)
2016
 
2015
 
2014
Service cost - benefits earned during the year
$
1

 
$
1

 
$
2

Interest cost on accumulated benefit obligation
4

 
5

 
5

Amortization of unrecognized actuarial gain and prior service credit
—

 
(4
)
 
(1
)
Curtailment gain
—

 
—

 
(2
)
Net periodic postretirement expense
$
5

 
$
2

 
$
4
Schedule of changes in benefit obligations for postretirement welfare plans
Information regarding the changes in benefit obligations for our postretirement welfare plans is as follows:
 
Years Ended March 31,
(In millions)
2016
 
2015
Benefit obligation at beginning of period
$
118

 
$
119

Service cost
1

 
1

Interest cost
4

 
5

Plan amendments
(16
)
 
—

Actuarial loss
3

 
5

Benefit payments
(11
)
 
(12
)
Curtailment gain
(1
)
 
—

Benefit obligation at end of period
$
98

 
$
118