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Employee Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of net periodic pension cost for the Company's defined-benefit pension plans
Net periodic pension cost for our defined-benefit pension plans, with the exception of service cost, is recorded in other income (expense), net, in our condensed consolidated statement of operations. Net periodic pension cost for our defined-benefit pension plans was as follows, in millions: 
 
Three Months Ended September 30,
 
2018
 
2017
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
1

 
$
—

 
$
1

 
$
—

Interest cost
8

 
1

 
11

 
2

Expected return on plan assets
(12
)
 
—

 
(12
)
 
—

Amortization of net loss
4

 
1

 
5

 
1

Net periodic pension cost
$
1

 
$
2

 
$
5

 
$
3

 
Nine Months Ended September 30,
 
2018
 
2017
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
2

 
$
—

 
$
2

 
$
—

Interest cost
28

 
4

 
36

 
5

Expected return on plan assets
(36
)
 
—

 
(36
)
 
—

Amortization of net loss
13

 
2

 
15

 
2

Net periodic pension cost
$
7

 
$
6

 
$
17

 
$
7