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Postretirement Benefits (Tables)
 12 Months Ended
Mar. 31, 2019
Defined Benefit Plan [Abstract]  
Schedule of net periodic (credit) expense for postretirement welfare benefits
The net periodic expense for our pension plans is as follows:
 
U.S. Plans
 
Non-U.S. Plans
 
Years Ended March 31,
 
Years Ended March 31,
(In millions)
2019
 
2018
 
2017
 
2019
 
2018
 
2017
Service cost - benefits earned during the year
$
—

 
$
3

 
$
5

 
$
15

 
$
15

 
$
15

Interest cost on projected benefit obligation
14

 
14

 
13

 
21

 
22

 
23

Expected return on assets
(16
)
 
(19
)
 
(15
)
 
(23
)
 
(26
)
 
(26
)
Amortization of unrecognized actuarial loss and prior service costs
5

 
6

 
11

 
4

 
5

 
4

Curtailment/settlement loss (gain)
4

 
2

 
—

 
1

 
1

 
(2
)
Net periodic pension expense
$
7

 
$
6

 
$
14

 
$
18

 
$
17

 
$
14

The net periodic (credit) expense for our postretirement welfare benefits is as follows:
 
Years Ended March 31,
(In millions)
2019
 
2018
 
2017
Service cost - benefits earned during the year
$
1

 
$
1

 
$
1

Interest cost on accumulated benefit obligation
2

 
2

 
2

Amortization of unrecognized actuarial gain and prior service credit
(5
)
 
(6
)
 
(1
)
Net periodic postretirement (credit) expense
$
(2
)
 
$
(3
)
 
$
2
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)
2019
 
2018
Benefit obligation at beginning of period
$
78

 
$
82

Service cost
1

 
1

Interest cost
2

 
2

Actuarial gain
(3
)
 
(1
)
Benefit payments
(5
)
 
(6
)
Benefit obligation at end of period
$
73

 
$
78