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Employee Retirement Plans | 6 Months Ended
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Jun. 30, 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 June 30,
| 2018 |  | 2017
| Qualified |  | Non-Qualified |  | Qualified |  | Non-Qualified
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 10 |  |  | 2 |  |  | 13 |  |  | 2 |
Expected return on plan assets | (12 | ) |  | — |  |  | (12 | ) |  | — |
Amortization of net loss | 5 |  |  | — |  |  | 5 |  |  | — |
Net periodic pension cost | $ | 3 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 2 |
| Six Months Ended June 30,
| 2018 |  | 2017
| Qualified |  | Non-Qualified |  | Qualified |  | Non-Qualified
Service cost | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |
Interest cost | 20 |  |  | 3 |  |  | 25 |  |  | 3 |
Expected return on plan assets | (24 | ) |  | — |  |  | (24 | ) |  | — |
Amortization of net loss | 9 |  |  | 1 |  |  | 10 |  |  | 1 |
Net periodic pension cost | $ | 6 |  |  | $ | 4 |  |  | $ | 12 |  |  | $ | 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.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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