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Employee Retirement Plans | 6 Months Ended
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Jun. 30, 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 June 30,
| 2016 |  | 2015
| Qualified |  | Non-Qualified |  | Qualified |  | Non-Qualified
Service cost | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |
Interest cost | 10 |  |  | 3 |  |  | 11 |  |  | 3 |
Expected return on plan assets | (9 | ) |  | — |  |  | (12 | ) |  | — |
Amortization of net loss | 3 |  |  | — |  |  | 5 |  |  | — |
Net periodic pension cost | $ | 4 |  |  | $ | 3 |  |  | $ | 5 |  |  | $ | 3 |
| Six Months Ended June 30,
| 2016 |  | 2015
| Qualified |  | Non-Qualified |  | Qualified |  | Non-Qualified
Service cost | $ | 1 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |
Interest cost | 21 |  |  | 4 |  |  | 23 |  |  | 4 |
Expected return on plan assets | (19 | ) |  | — |  |  | (23 | ) |  | — |
Amortization of net loss | 7 |  |  | 1 |  |  | 9 |  |  | 1 |
Net periodic pension cost | $ | 10 |  |  | $ | 5 |  |  | $ | 11 |  |  | $ | 5 |
In May 2016, we contributed $51 million to certain qualified defined-benefit pension plans, which was not included in our previous 2016 expected contributions. At June 30, 2016, we now expect to contribute a total of approximately $96 million to our qualified defined-benefit pension plans in 2016. 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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