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Postretirement Benefit Plans (Tables)
 6 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost for all significant postretirement benefit plans
Components of net periodic benefit cost for all of our significant postretirement benefit plans are shown in the tables below (in millions).
 
Pension Benefit Plans
 
Other Benefit Plans
 
Three Months Ended September 30,
 
Three Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Service cost
$
11

 
$
12

 
$
1

 
$
2

Interest cost
17

 
16

 
2

 
2

Expected return on assets
(18
)
 
(17
)
 
—

 
—

Amortization — losses, net
6

 
7

 
2

 
1

Amortization — prior service credit, net
—

 
(1
)
 
(9
)
 
(2
)
Net periodic benefit cost
$
16

 
$
17

 
$
(4
)
 
$
3

 
Pension Benefit Plans
 
Other Benefits
 
Six Months Ended September 30,
 
Six Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Service cost
$
22

 
$
25

 
$
2

 
$
5

Interest cost
34

 
32

 
3

 
4

Expected return on assets
(35
)
 
(33
)
 
—

 
—

Amortization — losses
12

 
12

 
4

 
2

Amortization — prior service credit, net
(1
)
 
(1
)
 
(19
)
 
(2
)
Termination benefits / curtailments
1

 
—

 
(2
)
 
—

Net periodic benefit cost
$
33

 
$
35

 
$
(12
)
 
$
9
Contributions to employee benefit plans
We contributed the following amounts to all plans (in millions).
 
Three Months Ended September 30,
 
Six Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Funded pension plans
$
8

 
$
4

 
$
12

 
$
10

Unfunded pension plans
3

 
3

 
4

 
5

Savings and defined contribution pension plans
5

 
4

 
11

 
9

Total contributions
$
16

 
$
11

 
$
27

 
$
24