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Pension Benefits
 6 Months Ended
Sep. 30, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Pension Benefits
Pension Benefits
The net periodic expense for our defined pension benefit plans 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)
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost - benefits earned during the year
$
2

 
$
—

 
$
5

 
$
5

 
$
2

 
$
1

 
$
10

 
$
9

Interest cost on projected benefit obligation
4

 
4

 
6

 
9

 
9

 
9

 
12

 
18

Expected return on assets
(4
)
 
(5
)
 
(8
)
 
(8
)
 
(9
)
 
(11
)
 
(16
)
 
(15
)
Amortization of unrecognized actuarial loss and prior service costs
12

 
6

 
1

 
1

 
21

 
10

 
2

 
2

Net periodic pension expense
$
14

 
$
5

 
$
4

 
$
7

 
$
23

 
$
9

 
$
8

 
$
14


Cash contributions to these plans were $10 million and $44 million for the second quarter and first six months of 2016 and $16 million and $31 million for the second quarter and first six months of 2015. The projected unit credit method is utilized in measuring net periodic pension expense over the employees’ service life for the pension plans. Unrecognized actuarial losses exceeding 10% of the greater of the projected benefit obligation or the market value of assets are amortized straight-line over the average remaining future service periods and expected life expectancy.