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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 June 30:
 
 
 
 
 
 
 
Service cost
$
35

 
$
35

 
$
3

 
$
3

Interest cost
22

 
23

 
5

 
6

Expected return on plan assets
(34
)
 
(31
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
15

 
9

 
—

 
—

Prior service credit
(6
)
 
—

 
(3
)
 
(6
)
Net periodic benefit cost
$
32

 
$
36

 
$
5

 
$
3

 
 
 
 
 
 
 
 
Six months ended June 30:
 
 
 
 
 
 
 
Service cost
$
71

 
$
70

 
$
6

 
$
6

Interest cost
44

 
46

 
9

 
11

Expected return on plan assets
(66
)
 
(62
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
29

 
17

 
—

 
—

Prior service cost (credit)
(9
)
 
1

 
(6
)
 
(11
)
Net periodic benefit cost
$
69

 
$
72

 
$
9

 
$
6