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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2014
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 June 30,
 
Six months ended June 30,
(millions)
2014
 
2013
 
2014
 
2013
Pension:
 
 
 
 
 
 
 
Service cost of benefits earned
$
9

 
$
9

 
$
18

 
$
19

Interest cost on projected benefit obligation
17

 
16

 
33

 
31

Expected return on plan assets
(20
)
 
(19
)
 
(40
)
 
(38
)
Net amortization
6

 
12

 
12

 
23

     Net pension cost
$
12

 
$
18

 
$
23

 
$
35

Postretirement:
 
 
 
 
 
 
 
Service cost of benefits earned
$
—

 
$
1

 
$
1

 
$
2

Interest cost on projected benefit obligation
2

 
2

 
4

 
3

Net amortization
(9
)
 
(9
)
 
(18
)
 
(17
)
     Net postretirement benefit
$
(7
)
 
$
(6
)
 
$
(13
)
 
$
(12
)