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Employee Retirement Plans
3 Months Ended
Mar. 31, 2018
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 March 31,
 
2018
 
2017
 
Qualified
 
Non-Qualified
 
Qualified
 
Non-Qualified
Service cost
$
1

 
$

 
$
1

 
$

Interest cost
10

 
1

 
12

 
1

Expected return on plan assets
(12
)
 

 
(12
)
 

Amortization of net loss
4

 
1

 
5

 
1

Net periodic pension cost
$
3

 
$
2

 
$
6

 
$
2

    
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.