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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS The Company has a number of employee benefit plans, including qualified and nonqualified defined-benefit plans, defined-contribution plans, postretirement medical benefits, and long-term disability benefits. In relation to the qualified plans, net periodic benefit costs recognized included the following components for the three and six months ended June 30, 2016 (in millions). Amounts recognized in relation to all other plans were immaterial to the quarter.
| Qualified Defined - Benefit Plans
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 9 |  |  | $ | 10 |  |  | $ | 18 |  |  | $ | 20 |
Interest cost | 19 |  |  | 21 |  |  | 37 |  |  | 42 |
Expected return on assets | (27 | ) |  | (30 | ) |  | (54 | ) |  | (61 | )
Recognized actuarial loss (gain) | 6 |  |  | 6 |  |  | 12 |  |  | 13 |
Total | $ | 7 |  |  | $ | 7 |  |  | $ | 13 |  |  | $ | 14 |

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