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Employee Retirement Plans | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Employee Retirement Plans | EMPLOYEE RETIREMENT PLANS Net periodic pension cost for our defined-benefit pension plans was as follows, in millions:
| Three Months Ended June 30,
| 2017 |  | 2016
| Qualified |  | Non-Qualified |  | Qualified |  | Non-Qualified
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 13 |  |  | 2 |  |  | 10 |  |  | 3 |
Expected return on plan assets | (12 | ) |  | — |  |  | (9 | ) |  | — |
Amortization of net loss | 5 |  |  | — |  |  | 3 |  |  | — |
Net periodic pension cost | $ | 6 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 3 |
| Six Months Ended June 30,
| 2017 |  | 2016
| Qualified |  | Non-Qualified |  | Qualified |  | Non-Qualified
Service cost | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |
Interest cost | 25 |  |  | 3 |  |  | 21 |  |  | 4 |
Expected return on plan assets | (24 | ) |  | — |  |  | (19 | ) |  | — |
Amortization of net loss | 10 |  |  | 1 |  |  | 7 |  |  | 1 |
Net periodic pension cost | $ | 12 |  |  | $ | 4 |  |  | $ | 10 |  |  | $ | 5 |
We froze all future benefit accruals under substantially all of our domestic and foreign qualified and domestic non-qualified defined benefit pension plans several years ago.

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