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EMPLOYEE BENEFIT PLANS | 9 Months Ended
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Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS Net periodic benefit costs for the qualified defined-benefit plans included the following components (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 10 |  |  | $ | 9 |  |  | $ | 30 |  |  | $ | 27 |
Interest cost | 19 |  |  | 18 |  |  | 55 |  |  | 55 |
Expected return on assets | (27 | ) |  | (27 | ) |  | (80 | ) |  | (81 | )
Amortization of prior service cost (credit) | (1 | ) |  | (1 | ) |  | (1 | ) |  | (1 | )
Recognized actuarial loss (gain) | 7 |  |  | 7 |  |  | 20 |  |  | 19 |
Total | $ | 8 |  |  | $ | 6 |  |  | $ | 24 |  |  | $ | 19 |
The Company contributed $15 million to the defined-benefit pension plan during the three months ended September 30, 2017.

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