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Pension Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2015
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
2015
 
2014
 
2015
 
2014
Three Months Ended June 30
 
 
 
 
 
 
 
Service cost
$
29

 
$
24

 
$
2

 
$
2

Interest cost
26

 
25

 
4

 
3

Expected return on plan assets
(28
)
 
(26
)
 
—

 
—

Amortization of net actuarial loss (gain)
13

 
8

 
—

 
(1
)
Amortization of net prior service cost (credit)
—

 
—

 
1

 
—

Net periodic benefit cost
$
40

 
$
31

 
$
7

 
$
4

 
 
 
 
 
 
 
 
Six Months Ended June 30
 
 
 
 
 
 
 
Service cost
$
59

 
$
49

 
$
5

 
$
4

Interest cost
51

 
50

 
8

 
7

Expected return on plan assets
(55
)
 
(53
)
 
—

 
—

Amortization of net actuarial loss (gain)
26

 
17

 
—

 
(3
)
Amortization of net prior service cost (credit)
—

 
—

 
1

 
—

Net periodic benefit cost
$
81

 
$
63

 
$
14

 
$
8