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Employee Retirement Plans
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Employee Retirement Plans
Employee Retirement Plans
The components of net pension and postretirement benefit costs are summarized in the following table:
 
Three months ended March 31,
(millions)
2017
 
2016
Pension:
 
 
 
Service cost of benefits earned
$
10

 
$
11

Interest cost on projected benefit obligation
16

 
17

Expected return on plan assets
(23
)
 
(22
)
Settlement
—

 
2

Net amortization
5

 
5

     Net pension cost (a)
$
8

 
$
13

Postretirement:
 
 
 
Service cost of benefits earned
$
1

 
$
1

Interest cost on projected benefit obligation
1

 
1

Net amortization
(6
)
 
(7
)
     Net postretirement benefit(b)
$
(4
)
 
$
(5
)

(a)
Net pension cost, excluding settlement costs, includes expenses allocated to income from discontinued operations for L&W totaling $2 million for the three months ended March 31, 2016.
(b)
Net postretirement benefit includes a net benefit allocated to income from discontinued operations for L&W totaling $1 million for the three months ended March 31, 2016.
During the first three months of 2017, we made cash contributions of $2 million to our pension plan in Canada. We expect to make total contributions to our pension plans in 2017 of approximately $74 million.