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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES          
Net loss $ 130 $ (393) $ (53) $ (981)  
Adjustments to reconcile net loss to net cash provided by operating activities:          
Deferred income taxes     (40) (351)  
Impairment of long-lived assets     0 258  
Depreciation     365 374  
Amortization     33 33  
Stock-based compensation     23 20  
Changes in certain operating assets and liabilities     1,438 242  
Deferred federal payroll support program grants     0 49  
Losses on sale-leaseback transactions 0 106 0 106 $ (106)
Other, net     (11) 27  
Net cash provided by (used in) operating activities     1,755 (223)  
CASH FLOWS FROM INVESTING ACTIVITIES          
Capital expenditures     (770) (529)  
Predelivery deposits for flight equipment     (33) (67)  
Proceeds from the maturities of held-to-maturity investments     0 21  
Purchase of available-for-sale securities     (520) (1,162)  
Proceeds from the sale of available-for-sale securities     590 944  
Proceeds from sale-leaseback transactions   209 0 209 209
Other, net     (2) (1)  
Net cash used in investing activities     (735) (585)  
CASH FLOWS FROM FINANCING ACTIVITIES          
Proceeds from issuance of long-term debt     1,010 2,541  
Proceeds from short-term borrowings     0 981  
Proceeds from sale-leaseback transactions   118 0 236 354
Proceeds from issuance of common stock     22 22  
Proceeds from issuance of stock warrants     14 28  
Repayment of long-term debt and finance lease obligations     (1,775) (272)  
Repayment of short-term borrowings     0 (1,000)  
Acquisition of treasury stock     (7) (167)  
Other, net     (1) 0  
Net cash (used in) provided by financing activities     (737) 2,369  
INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH     283 1,561  
Cash, cash equivalents and restricted cash at beginning of period     1,969 1,018 1,018
Cash, cash equivalents and restricted cash at end of period 2,252 [1] 2,579 [1] 2,252 [1] 2,579 [1] 1,969
SUPPLEMENTAL CASH FLOW INFORMATION          
Cash payments for interest (net of amount capitalized)     121 37  
Cash payments for income taxes (net of refunds)     0 0  
NON-CASH TRANSACTIONS          
Operating lease assets obtained in exchange for operating lease liabilities     0 144  
Lease modifications and lease conversions     40 0  
Cash and cash equivalents 2,193 [1] 2,453 [1] 2,193 [1] 2,453 [1] 1,918
Short-term restricted cash recorded within prepaid expenses and other [1] 0 74 0 74  
Restricted cash [1] 59 52 59 52  
Total cash, cash equivalents and restricted cash $ 2,252 [1] $ 2,579 [1] $ 2,252 [1] $ 2,579 [1] $ 1,969
[1]
(1) Reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets:
September 30, 2021September 30, 2020
Cash and cash equivalents$2,193 $2,453 
Short-term restricted cash recorded within prepaid expenses and other— 74 
Restricted cash59 52 
Total cash, cash equivalents and restricted cash$2,252 $2,579