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Consolidated Statements of Cash Flows
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES      
Net (loss) income $ (182) $ (1,354) $ 569
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Deferred income taxes (88) (329) 139
Impairment of long-lived assets 0 273 0
Depreciation and amortization 540 535 525
Stock-based compensation 28 28 31
Losses on sale-leaseback transactions 0 106 0
Gain (Loss) on Extinguishment of Debt 50 9 0
Unrealized Gain (Loss) on Investments (49) 2 (21)
Changes in certain operating assets and liabilities:      
Decrease (increase) in receivables (46) 144 (3)
Decrease in inventories, prepaid and other 138 52 188
Increase in air traffic liability 447 66 118
Increase (decrease) in accounts payable and other accrued liabilities 806 (255) (91)
Other, net (2) 40 (6)
Net cash provided by (used in) operating activities 1,642 (683) 1,449
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (907) (715) (932)
Pre-delivery deposits for flight equipment (88) (76) (224)
Purchase of held-to-maturity investments (37) 0 (374)
Proceeds from the maturities of held-to-maturity investments 0 21 534
Purchase of available-for-sale securities (1,577) (1,962) (1,000)
Proceeds from the sale of available-for-sale securities 1,910 1,174 880
Proceeds from sale-leaseback transactions 0 209 0
Other, net (5) 0 (13)
Net cash (used in) investing activities (704) (1,349) (1,129)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from issuance of long-term debt 1,010 2,541 981
Proceeds from short-term borrowings 0 981 0
Proceeds from sale-leaseback transactions 0 354 0
Proceeds from issuance of common stock 46 619 51
Proceeds from issuance of stock warrants 14 28 0
Repayment of long-term debt and finance lease obligations (1,892) (372) (323)
Repayment of short-term borrowings 0 (1,000) 0
Acquisition of treasury stock (8) (167) (542)
Other, net 0 (1) (2)
Net cash provided by (used in) financing activities (830) 2,983 165
INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 108 951 485
Cash, cash equivalents and restricted cash at beginning of period 1,969 1,018 533
Cash, cash equivalents, and restricted cash at end of period 2,077 1,969 1,018
SUPPLEMENTAL CASH FLOW INFORMATION      
Cash payments for interest 180 139 62
Cash payments for income taxes (net of refunds) 3 5 (52)
Operating lease assets obtained in exchange for operating lease liabilities 46 144 7
Cash and cash equivalents 2,018 1,918 959
Restricted cash 59 51 59
Total cash, cash equivalents and restricted cash $ 2,077 $ 1,969 $ 1,018