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Employee Retirement Plans
 6 Months Ended
Jun. 30, 2020
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 June 30,
 20202019
 QualifiedNon-QualifiedQualifiedNon-Qualified
Interest cost$7  $1  $9  $2  
Expected return on plan assets(5) —  (11) —  
Amortization of net loss5  1  6  —  
Net periodic pension cost$7  $2  $4  $2  
 Six Months Ended June 30,
 20202019
 QualifiedNon-QualifiedQualifiedNon-Qualified
Service cost$1  $—  $1  $—  
Interest cost13  2  19  3  
Expected return on plan assets(11) —  (22) —  
Amortization of net loss11  2  10  1  
Net periodic pension cost$14  $4  $8  $4  

        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. In December 2019, our Board of Directors approved the termination of our qualified domestic defined-benefit pension plans in 2021.