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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS Net periodic benefit costs for qualified defined-benefit plans include the following (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 12 |  |  | $ | 10 |  |  | $ | 24 |  |  | $ | 20 |
Pension expense included in Wages and benefits | 12 |  |  | 10 |  |  | 24 |  |  | 20 |
Interest cost | 19 |  |  | 18 |  |  | 39 |  |  | 36 |
Expected return on assets | (26 | ) |  | (26 | ) |  | (53 | ) |  | (53 | )
Recognized actuarial loss (gain) | 8 |  |  | 6 |  |  | 16 |  |  | 13 |
Pension expense (benefit) included in Nonoperating Income (Expense) | $ | 1 |  |  | $ | (2 | ) |  | $ | 2 |  |  | $ | (4 | )

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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