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Employee Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of net pension and postretirement benefits costs
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)
2013
 
2012
 
2013
 
2012
Pension:
 
 
 
 
 
 
 
Service cost of benefits earned
$
10

 
$
8

 
$
29

 
$
23

Interest cost on projected benefit obligation
16

 
16

 
47

 
48

Expected return on plan assets
(19
)
 
(18
)
 
(57
)
 
(52
)
Net amortization
11

 
9

 
34

 
26

     Net pension cost
$
18

 
$
15

 
$
53

 
$
45

Postretirement:
 
 
 
 
 
 
 
Service cost of benefits earned
$
1

 
$
1

 
$
3

 
$
3

Interest cost on projected benefit obligation
2

 
2

 
5

 
6

Net amortization
(9
)
 
(9
)
 
(26
)
 
(27
)
     Net postretirement cost
$
(6
)
 
$
(6
)
 
$
(18
)
 
$
(18
)