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Employee Retirement Plans
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Retirement Plans
Employee Retirement Plans
The components of net pension and postretirement benefits costs are summarized in the following table:
 
Three months ended September 30,
 
Nine months ended September 30,
(millions)
2015
 
2014
 
2015
 
2014
Pension:
 
 
 
 
 
 
 
Service cost of benefits earned
$
12

 
$
9

 
$
37

 
$
27

Interest cost on projected benefit obligation
16

 
16

 
50

 
49

Expected return on plan assets
(20
)
 
(20
)
 
(62
)
 
(60
)
Settlement
1

 
—

 
1

 
—

Net amortization
10

 
7

 
29

 
19

     Net pension cost
$
19

 
$
12

 
$
55

 
$
35

Postretirement:
 
 
 
 
 
 
 
Service cost of benefits earned
$
1

 
$
1

 
$
2

 
$
2

Interest cost on projected benefit obligation
1

 
1

 
4

 
5

Net amortization
(8
)
 
(8
)
 
(24
)
 
(26
)
     Net postretirement benefit
$
(6
)
 
$
(6
)
 
$
(18
)
 
$
(19
)

During the first nine months of 2015, we made cash contributions of $50 million to the USG Corporation Retirement Plan Trust, $6 million to our pension plan in Canada, and $4 million, in aggregate, to certain other domestic pension plans. We expect to make total contributions to our pension plans in 2015 of approximately $62 million.