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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Net Income | $ 193 | $ 293 | $ 197 | $ 386
Related to marketable securities: |  |  |  |
Unrealized holding gain (loss) arising during the period | (4) | 1 | (17) | 4
Reclassification of (gain) loss into Other—net nonoperating income (expense) | 1 | 1 | 3 | 1
Income tax effect | 0 | (1) | 3 | (2)
Total | (3) | 1 | (11) | 3
Related to employee benefit plans: |  |  |  |
Reclassification of net pension expense into Wages and benefits | 7 | 5 | 14 | 11
Income tax effect | (1) | (1) | (3) | (3)
Total | 6 | 4 | 11 | 8
Related to interest rate derivative instruments: |  |  |  |
Unrealized holding gain (loss) arising during the period | 2 | (3) | 8 | (2)
Reclassification of (gain) loss into Aircraft rent | 0 | 2 | 1 | 2
Income tax effect | 0 | 1 | (2) | 0
Total | 2 | 0 | 7 | 0
Other Comprehensive Income | 5 | 5 | 7 | 11
Comprehensive Income | $ 198 | $ 298 | $ 204 | $ 397

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