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Employee Retirement Plans | 3 Months Ended
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Mar. 31, 2021
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,
| 2021 |  | 2020
| Qualified |  | Non-Qualified |  | Qualified |  | Non-Qualified
Service cost | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |
Interest cost | 8 |  |  | 1 |  |  | 6 |  |  | 1 |
Expected return on plan assets | (4) |  |  | — |  |  | (6) |  |  | — |
Amortization of net loss | 6 |  |  | 1 |  |  | 6 |  |  | 1 |
Net periodic pension cost | $ | 11 |  |  | $ | 2 |  |  | $ | 7 |  |  | $ | 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. In December 2019, our Board of Directors approved the termination of our qualified domestic defined-benefit pension plans. These plans are expected to be settled in the second quarter of 2021.

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