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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES          
Net loss $ 64 $ (320) $ (183) $ (588)  
Adjustments to reconcile net loss to net cash provided by operating activities:          
Deferred income taxes     (93) (198)  
Impairment of long-lived assets     0 202  
Depreciation     238 255  
Amortization     20 24  
Stock-based compensation     17 15  
Changes in certain operating assets and liabilities     1,439 147  
Deferred federal payroll support program grants     185 363  
Other, net     35 3  
Net cash provided by operating activities     1,658 223  
CASH FLOWS FROM INVESTING ACTIVITIES          
Capital expenditures     (524) (377)  
Predelivery deposits for flight equipment     (16) (57)  
Purchase of available-for-sale securities     (520) (861)  
Proceeds from the sale of available-for-sale securities     340 890  
Other, net     (2) 0  
Net cash used in investing activities     (722) (405)  
CASH FLOWS FROM FINANCING ACTIVITIES          
Proceeds from issuance of long-term debt     1,010 1,517  
Proceeds from short-term borrowings     0 981  
Proceeds from sale-leaseback transactions     0 118 $ 354
Proceeds from issuance of common stock     22 22  
Proceeds from issuance of stock warrants     14 18  
Repayment of long-term debt and finance lease obligations     (1,481) (177)  
Repayment of short-term borrowings     0 (3)  
Acquisition of treasury stock     (7) (167)  
Other, net     (1) 0  
Net cash (used in) provided by financing activities     (443) 2,309  
INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH     493 2,127  
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 2,462 [1] 3,145 [1] 2,462 [1] 3,145 [1] 1,969
SUPPLEMENTAL CASH FLOW INFORMATION          
Cash payments for interest (net of amount capitalized)     97 45  
Cash payments for income taxes (net of refunds)     0 0  
NON-CASH TRANSACTIONS          
Operating lease assets obtained in exchange for operating lease liabilities     0 2  
Cash and cash equivalents 2,409 2,561 2,409 2,561 1,918
Restricted cash 53 [1] 584 53 [1] 584  
Total cash, cash equivalents and restricted cash $ 2,462 [1] $ 3,145 [1] $ 2,462 [1] $ 3,145 [1] $ 1,969
[1] Reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets: