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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Net Cash Provided by Operating Activities    
Net Cash Provided by Operating Activities $ 4,843 $ 4,306
Property and equipment additions:    
Flight equipment, including advance payments (1,704) (1,879)
Ground property and equipment, including technology (748) (845)
Purchase of short-term investments (2,011) (474)
Redemption of short-term investments 1,961 2,289
Purchase of equity investments 0 (100)
Other, net 20 108
Net cash used in investing activities (2,482) (901)
Cash Flows from Financing Activities:    
Payments on debt and finance lease obligations (2,986) (2,395)
Other, net (24) (27)
Net cash used in financing activities (3,010) (2,422)
Net (Decrease)/Increase in Cash, Cash Equivalents and Restricted Cash Equivalents (649) 983
Cash, cash equivalents and restricted cash equivalents at beginning of period 3,473 8,569
Cash, cash equivalents and restricted cash equivalents at end of period 2,824 9,552
Non-Cash Transactions:    
Right-of-use assets acquired under operating leases 144 324
Flight and ground equipment acquired under finance leases 36 81
Operating leases converted to finance leases 43 140
Equity investments and other financings 0 330
Current Assets:    
Cash and cash equivalents 2,668 9,221
Restricted cash included in prepaid expenses and other 156 154
Noncurrent Assets:    
Restricted cash included in other noncurrent assets 0 177
Total cash, cash equivalents and restricted cash equivalents $ 2,824 $ 9,552