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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES      
Net (loss) income $ (1,354) $ 569 $ 189
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Deferred income taxes (329) 139 90
Impairment of long-lived assets 273 0 319
Depreciation and amortization 535 525 469
Stock-based compensation 28 31 28
Losses on sale-leaseback transactions 106 0 0
Changes in certain operating assets and liabilities:      
Decrease (increase) in receivables 144 (3) 46
Decrease (increase) in inventories, prepaid and other 52 188 (178)
Increase in air traffic liability 66 118 131
(Decrease) increase in accounts payable and other accrued liabilities (255) (91) 103
Other, net 51 (27) 3
Net cash (used in) provided by operating activities (683) 1,449 1,200
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (715) (932) (908)
Pre-delivery deposits for flight equipment (76) (224) (206)
Purchase of held-to-maturity investments 0 (374) (429)
Proceeds from the maturities of held-to-maturity investments 21 534 505
Purchase of available-for-sale securities (1,962) (1,000) (979)
Proceeds from the sale of available-for-sale securities 1,174 880 875
Proceeds from sale-leaseback transactions 209 0 0
Other, net 0 (13) (15)
Net cash (used in) investing activities (1,349) (1,129) (1,157)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from issuance of long-term debt 2,541 981 687
Proceeds from short-term borrowings 981 0 0
Proceeds from sale-leaseback transactions 354 0 0
Proceeds from issuance of common stock 620 51 48
Proceeds from issuance of stock warrants 28 0 0
Repayment of long-term debt and finance lease obligations (372) (323) (222)
Repayment of short-term borrowings (1,000) 0 0
Acquisition of treasury stock (167) (542) (382)
Other, net (2) (2) 0
Net cash provided by financing activities 2,983 165 131
INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 951 485 174
Cash, cash equivalents and restricted cash at beginning of period 1,018 533 359
Cash, cash equivalents, and restricted cash at end of period 1,969 1,018 533
SUPPLEMENTAL CASH FLOW INFORMATION      
Cash payments for interest (net of amount capitalized) 139 62 59
Cash payments for income taxes (net of refunds) 5 (52) 11
Operating lease assets obtained in exchange for operating lease liabilities 144 7 20
Total cash, cash equivalents and restricted cash $ 1,018 $ 1,018 $ 533