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Pension Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
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
2016
 
2015
 
2016
 
2015
Three Months Ended March 31
 
 
 
 
 
 
 
Service cost
$
26

 
$
30

 
$
1

 
$
3

Interest cost
26

 
25

 
3

 
4

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

 
—

Amortization of net actuarial loss (gain)
8

 
13

 
—

 
—

Amortization of net prior service cost (credit)
—

 
—

 
(6
)
 
—

Termination benefits expense
44

 
—

 
—

 
—

Curtailment expense
8

 
—

 
(3
)
 
—

Net periodic benefit cost
$
85

 
$
41

 
$
(5
)
 
$
7