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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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 (in millions) :
 
Pension Plans
 
Other Postretirement
Benefit Plans
 
2013
 
2012
 
2013
 
2012
Three months ended March 31:
 
 
 
 
 
 
 
Service cost
$
36

 
$
35

 
$
3

 
$
3

Interest cost
22

 
23

 
4

 
5

Expected return on plan assets
(32
)
 
(31
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service cost (credit)
(3
)
 
1

 
(3
)
 
(5
)
Net actuarial loss
14

 
8

 
—

 
—

Net periodic benefit cost
$
37

 
$
36

 
$
4

 
$
3