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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2014
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
 
2014
 
2013
 
2014
 
2013
Three months ended September 30:
 
 
 
 
 
 
 
Service cost
$
30

 
$
34

 
$
3

 
$
3

Interest cost
23

 
21

 
4

 
4

Expected return on plan assets
(34
)
 
(33
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(6
)
 
(5
)
 
(5
)
 
(4
)
Net actuarial (gain) loss
9

 
14

 
(1
)
 
—

Net periodic benefit cost
$
22

 
$
31

 
$
1

 
$
3

 
 
 
 
 
 
 
 
Nine months ended September 30:
 
 
 
 
 
 
 
Service cost
$
90

 
$
105

 
$
6

 
$
9

Interest cost
69

 
65

 
12

 
13

Expected return on plan assets
(100
)
 
(99
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service credit
(16
)
 
(14
)
 
(14
)
 
(10
)
Net actuarial (gain) loss
26

 
43

 
(1
)
 
—

Net periodic benefit cost
$
69

 
$
100

 
$
3

 
$
12