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Pension Plans and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost Table
The following summarizes the Company’s pension and other postretirement benefit cost:
 
Pension Benefits
 
Other Benefits
millions
2014
 
2013
 
2014
 
2013
Three Months Ended September 30
 
 
 
 
 
 
 
Service cost
$
25

 
$
21

 
$
1

 
$
2

Interest cost
25

 
19

 
4

 
3

Expected return on plan assets
(27
)
 
(22
)
 
—

 
—

Amortization of net actuarial loss (gain)
9

 
29

 
(2
)
 
—

Amortization of net prior service cost (credit)
—

 
—

 
—

 
1

Net periodic benefit cost
$
32

 
$
47

 
$
3

 
$
6

 
 
 
 
 
 
 
 
Nine Months Ended September 30
 
 
 
 
 
 
 
Service cost
$
74

 
$
64

 
$
5

 
$
7

Interest cost
75

 
58

 
11

 
10

Expected return on plan assets
(80
)
 
(68
)
 
—

 
—

Amortization of net actuarial loss (gain)
26

 
88

 
(5
)
 
—

Amortization of net prior service cost (credit)
—

 
—

 
—

 
1

Net periodic benefit cost
$
95

 
$
142

 
$
11

 
$
18