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Pension Plans and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [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
2018
 
2017
 
2018
 
2017
Three Months Ended September 30
 
 
 
 
 
 
 
Service cost
$
23

 
$
22

 
$
—

 
$
—

Interest cost
19

 
21

 
3

 
3

Expected (return) loss on plan assets
(20
)
 
(21
)
 
—

 
—

Amortization of net actuarial loss (gain)
6

 
7

 
—

 
—

Amortization of net prior service cost (credit)
—

 
(1
)
 
(6
)
 
(6
)
Settlement expense
9

 
22

 
—

 
—

Termination benefits expense
7

 
—

 
—

 
—

Net periodic benefit cost (1)
$
44

 
$
50

 
$
(3
)
 
$
(3
)
 
 
 
 
 
 
 
 
Nine Months Ended September 30
 
 
 
 
 
 
 
Service cost
$
68

 
$
64

 
$
1

 
$
1

Interest cost
57

 
63

 
8

 
9

Expected (return) loss on plan assets
(61
)
 
(63
)
 
—

 
—

Amortization of net actuarial loss (gain)
19

 
20

 
—

 
—

Amortization of net prior service cost (credit)
—

 
(1
)
 
(18
)
 
(18
)
Settlement expense
9

 
80

 
—

 
—

Termination benefits expense
7

 
4

 
—

 
—

Net periodic benefit cost (1)
$
99

 
$
167

 
$
(9
)
 
$
(8
)

__________________________________________________________________
(1) 
The service cost component of net periodic benefit cost is included in G&A; oil and gas operating expense; gathering, processing, and marketing expense; and exploration expense, and all other components of net periodic benefit cost are included in other (income) expense on the Company’s Consolidated Statements of Income.