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CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Income | $ 769 | $ 437 | $ 960
Related to marketable securities: |  |  |
Unrealized holding gains (losses) arising during the period | 31 | (14) | (4)
Reclassification of (gains) losses into Other-net non-operating income (expense) | (5) | 8 | 1
Income tax benefit (expense) | (6) | 2 | 1
Marketable securities, net of tax | 20 | (4) | (2)
Related to employee benefit plans: |  |  |
Actuarial losses related to pension and other postretirement benefit plans | (71) | (34) | (123)
Reclassification of net pension expense into Wages and benefits and Other-net non-operating income | 32 | 28 | 22
Income tax benefit (expense) | 10 | 2 | 24
Employee benefit plans, net of tax | 29 | 4 | 77
Related to interest rate derivative instruments: |  |  |
Unrealized holding gains (losses) arising during the period | (13) | 0 | 1
Reclassification of losses into Aircraft rent | 3 | 3 | 5
Income tax benefit (expense) | 2 | (1) | (2)
Interest rate derivative instruments, net of tax | (8) | 2 | 4
Other comprehensive income (loss) | (17) | (6) | (75)
Comprehensive income | $ 752 | $ 431 | $ 885

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