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Pension Plans and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 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 September 30
 
 
 
 
 
 
 
Service cost
$
30

 
$
25

 
$
3

 
$
1

Interest cost
25

 
25

 
3

 
4

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

 
—

Amortization of net actuarial loss (gain)
13

 
9

 
—

 
(2
)
Amortization of net prior service cost (credit)
—

 
—

 
1

 
—

Net periodic benefit cost
$
41

 
$
32

 
$
7

 
$
3

 
 
 
 
 
 
 
 
Nine Months Ended September 30
 
 
 
 
 
 
 
Service cost
$
89

 
$
74

 
$
8

 
$
5

Interest cost
76

 
75

 
11

 
11

Expected return on plan assets
(82
)
 
(80
)
 
—

 
—

Amortization of net actuarial loss (gain)
39

 
26

 
—

 
(5
)
Amortization of net prior service cost (credit)
—

 
—

 
2

 
—

Net periodic benefit cost
$
122

 
$
95

 
$
21

 
$
11