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Pension Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 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 June 30
 
 
 
 
 
 
 
Service cost
$
24

 
$
22

 
$
2

 
$
3

Interest cost
25

 
19

 
3

 
3

Expected return on plan assets
(26
)
 
(23
)
 
—

 
—

Amortization of net actuarial loss (gain)
8

 
30

 
(1
)
 
—

Net periodic benefit cost
$
31

 
$
48

 
$
4

 
$
6

 
 
 
 
 
 
 
 
Six Months Ended June 30
 
 
 
 
 
 
 
Service cost
$
49

 
$
43

 
$
4

 
$
5

Interest cost
50

 
39

 
7

 
7

Expected return on plan assets
(53
)
 
(46
)
 
—

 
—

Amortization of net actuarial loss (gain)
17

 
59

 
(3
)
 
—

Net periodic benefit cost
$
63

 
$
95

 
$
8

 
$
12