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EMPLOYEE BENEFIT PLANS | 3 Months Ended
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Mar. 31, 2018
Compensation and Retirement Disclosure [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS See Note 2 for a discussion of the impacts of ASU 2017-07, "Compensation - Retirement Benefits" which became effective January 1, 2018. Net periodic benefit costs for qualified defined-benefit plans include the following (in millions):
| Three Months Ended March 31,
| 2018 |  | 2017
Service cost | $ | 12 |  |  | $ | 10 |
Pension expense included in Wages and benefits | 12 |  |  | 10 |
Interest cost | 20 |  |  | 18 |
Expected return on assets | (27 | ) |  | (27 | )
Recognized actuarial loss (gain) | 8 |  |  | 7 |
Pension expense (benefit) included in Nonoperating | $ | 1 |  |  | $ | (2 | )

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