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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2019
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 June 30,
 
2019
 
2018
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Interest cost
$
9

 
$
2

 
$
10

 
$
2

Expected return on plan assets
(11
)
 
—

 
(12
)
 
—

Amortization of net loss
6

 
—

 
5

 
—

Net periodic pension cost
$
4

 
$
2

 
$
3

 
$
2


 
Six Months Ended June 30,
 
2019
 
2018
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
1

 
$
—

 
$
1

 
$
—

Interest cost
19

 
3

 
20

 
3

Expected return on plan assets
(22
)
 
—

 
(24
)
 
—

Amortization of net loss
10

 
1

 
9

 
1

Net periodic pension cost
$
8

 
$
4

 
$
6

 
$
4