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