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Employee Retirement Plans (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 30,
(millions)
2016
 
2015
 
2016
 
2015
Pension:
 
 
 
 
 
 
 
Service cost of benefits earned
$
11

 
$
12

 
$
34

 
$
37

Interest cost on projected benefit obligation
17

 
16

 
51

 
50

Expected return on plan assets
(22
)
 
(20
)
 
(66
)
 
(62
)
Settlement
1

 
1

 
3

 
1

Net amortization
5

 
10

 
14

 
29

     Net pension cost 
$
12

 
$
19

 
$
36

 
$
55

Postretirement:
 
 
 
 
 
 
 
Service cost of benefits earned
$
1

 
$
1

 
$
2

 
$
2

Interest cost on projected benefit obligation
1

 
1

 
4

 
4

Net amortization
(7
)
 
(8
)
 
(21
)
 
(24
)
     Net postretirement benefit\
$
(5
)
 
$
(6
)
 
$
(15
)
 
$
(18
)