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EMPLOYEE BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2018
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Benefit Costs | 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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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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