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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of net pension and postretirement benefits costs
The components of net pension and postretirement benefit costs are summarized in the following table:
 
Three months ended June 30,
 
Six months ended June 30,
(millions)
2016
 
2015
 
2016
 
2015
Pension:
 
 
 
 
 
 
 
Service cost of benefits earned
$
12

 
$
12

 
$
23

 
$
25

Interest cost on projected benefit obligation
17

 
17

 
34

 
34

Expected return on plan assets
(22
)
 
(21
)
 
(44
)
 
(42
)
Settlement
—

 
—

 
2

 
—

Net amortization
4

 
10

 
9

 
19

     Net pension cost
$
11

 
$
18

 
$
24

 
$
36

Postretirement:
 
 
 
 
 
 
 
Service cost of benefits earned
$
—

 
$
—

 
$
1

 
$
1

Interest cost on projected benefit obligation
2

 
2

 
3

 
3

Net amortization
(7
)
 
(8
)
 
(14
)
 
(16
)
     Net postretirement benefit
$
(5
)
 
$
(6
)
 
$
(10
)
 
$
(12
)