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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2011
Employee Benefit Plans [Abstract] 
Periodic benefit cost related to our defined benefit plans, net
The components of net periodic benefit cost related to our defined benefit plans were as follows for the three and nine months ended September 30, 2011 and 2010 (in millions):

 
Pension Plans
 
Other Postretirement
Benefit Plans
 
2011
 
2010
 
2011
 
2010
Three months ended September 30:
 
 
 
 
 
 
 
Service cost
$
28

 
$
22

 
$
4

 
$
3

Interest cost
21

 
21

 
5

 
6

Expected return on plan assets
(28
)
 
(28
)
 
—

 
—

Amortization of:

 
 
 
 
 
 
Prior service cost (credit)
1

 
1

 
(6
)
 
(5
)
Net loss
3

 
—

 
—

 
1

Net periodic benefit cost
$
25

 
$
16

 
$
3

 
$
5

 
 
 
 
 
 
 
 
Nine months ended September 30:
 
 
 
 
 
 
 
Service cost
$
73

 
$
65

 
$
9

 
$
8

Interest cost
64

 
62

 
16

 
19

Expected return on plan assets
(84
)
 
(84
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service cost (credit)
2

 
2

 
(17
)
 
(15
)
Net loss
9

 
1

 
1

 
3

Net periodic benefit cost
$
64

 
$
46

 
$
9

 
$
15