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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2013
Employee Benefit Plans [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block]
(5)
Employee Benefit Plans

Net periodic benefit cost for the pension and other postretirement benefit plans included the following components (in millions):

 
 
Three-Month Periods
 
Nine-Month Periods
 
 
Ended September 30,
 
Ended September 30,
 
 
2013
 
2012
 
2013
 
2012
Pension:
 
 
 
 
 
 
 
 
Service cost
 
$
1

 
$
2

 
$
4

 
$
6

Interest cost
 
14

 
15

 
41

 
45

Expected return on plan assets
 
(19
)
 
(19
)
 
(56
)
 
(56
)
Net amortization
 
12

 
9

 
36

 
26

Net periodic benefit cost
 
$
8

 
$
7

 
$
25

 
$
21

 
 
 
 
 
 
 
 
 
Other postretirement:
 
 
 
 
 
 
 
 
Service cost
 
$
2

 
$
2

 
$
6

 
$
5

Interest cost
 
6

 
7

 
19

 
21

Expected return on plan assets
 
(7
)
 
(7
)
 
(22
)
 
(22
)
Net amortization
 
2

 
1

 
6

 
3

Net periodic benefit cost
 
$
3

 
$
3

 
$
9

 
$
7



Employer contributions to the pension and other postretirement benefit plans are expected to be $64 million and $13 million, respectively, during 2013. As of September 30, 2013, $62 million and $4 million of contributions had been made to the pension and other postretirement benefit plans, respectively.