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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net Income (Loss) $ 397 $ (214) $ 266 $ (446)
Related to marketable securities:        
Unrealized holding gain (loss) arising during the period 0 31 (11) 30
Reclassification of (gain) loss into Other - net nonoperating income (expense) (2) (6) (6) (9)
Income tax effect 1 (6) 4 (5)
Total (1) 19 (13) 16
Related to employee benefit plans:        
Reclassification of net pension expense into Wages and benefits and Other - net nonoperating income (expense) (9) (8) (17) (15)
Income tax effect (2) (2) (4) (4)
Total 7 6 13 11
Related to interest rate derivative instruments:        
Unrealized holding gain (loss) arising during the period (1) (2) (9) (27)
Reclassification of loss into Aircraft rent 0 0 0 (1)
Income tax effect 0 (1) (2) (6)
Total 1 (1) 7 (20)
Other Comprehensive Income (Loss) 7 24 7 7
Comprehensive Income (Loss) $ 404 $ (190) $ 273 $ (439)