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Employee Retirement Plans
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Employee Retirement Plans EMPLOYEE RETIREMENT 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,
 
2019
 
2018
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
1

 
$
—

 
$
1

 
$
—

Interest cost
11

 
2

 
8

 
1

Expected return on plan assets
(12
)
 
—

 
(12
)
 
—

Amortization of net loss
4

 
1

 
4

 
1

Net periodic pension cost
$
4

 
$
3

 
$
1

 
$
2


 
Nine Months Ended September 30,
 
2019
 
2018
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
2

 
$
—

 
$
2

 
$
—

Interest cost
30

 
5

 
28

 
4

Expected return on plan assets
(34
)
 
—

 
(36
)
 
—

Amortization of net loss
14

 
2

 
13

 
2

Net periodic pension cost
$
12

 
$
7

 
$
7

 
$
6


As of January 1, 2010, substantially all of our domestic and foreign qualified and domestic non-qualified defined-benefit pension plans were frozen to future benefit accruals.