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Employee Retirement Plans
 3 Months Ended
Mar. 31, 2014
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 March 31,
(millions)
 
2014
 
2013
Pension:
 
 
 
 
Service cost of benefits earned
 
$
9

 
$
10

Interest cost on projected benefit obligation
 
16

 
16

Expected return on plan assets
 
(20
)
 
(19
)
Net amortization
 
6

 
11

     Net pension cost
 
$
11

 
$
18

Postretirement:
 
 
 
 
Service cost of benefits earned
 
$
1

 
$
1

Interest cost on projected benefit obligation
 
2

 
2

Net amortization
 
(9
)
 
(9
)
     Net postretirement (benefit) cost
 
$
(6
)
 
$
(6
)

During the first three months of 2014, we made cash contributions of $5 million to our pension plan in Canada. Including that contribution, we expect to make total contributions to our pension plans in 2014 of approximately $59 million.