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Employee Retirement Plans | 3 Months Ended
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Mar. 31, 2016
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 March 31,
| 2016 |  | 2015
| Qualified |  | Non-Qualified |  | Qualified |  | Non-Qualified
Service cost | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |
Interest cost | 11 |  |  | 1 |  |  | 12 |  |  | 1 |
Expected return on plan assets | (10 | ) |  | — |  |  | (11 | ) |  | — |
Amortization of net loss | 4 |  |  | 1 |  |  | 4 |  |  | 1 |
Net periodic pension cost | $ | 6 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 2 |
We froze all future benefit accruals under substantially all of our domestic qualified and foreign and domestic non-qualified defined benefit pension plans several years ago.

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