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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Net Cash Provided by Operating Activities    
Net Cash Provided by Operating Activities $ 4,857 $ 4,843 Close
Property and equipment additions:    
Flight equipment, including advance payments (1,891) (1,704)
Ground property and equipment, including technology (611) (748)
Purchase of short-term investments 0 (2,011)
Redemption of short-term investments 1,013 1,961
Other, net 43 20
Net cash used in investing activities (1,446) (2,482) Close
Cash Flows from Financing Activities:    
Payments on debt and finance lease obligations (2,149) (2,986)
Cash dividends (128) 0
Other, net (22) (24)
Net cash used in financing activities (2,299) (3,010) Close
Net Increase/(Decrease) in Cash, Cash Equivalents and Restricted Cash Equivalents 1,112 (649) Close
Cash, cash equivalents and restricted cash equivalents at beginning of period 3,395 3,473
Cash, cash equivalents and restricted cash equivalents at end of period 4,507 2,824
Non-Cash Transactions:    
Right-of-use assets acquired or modified under operating leases 161 144
Flight and ground equipment acquired or modified under finance leases 18 36
Operating leases converted to finance leases 0 43
Current Assets:    
Cash and cash equivalents 4,110 2,668
Restricted cash included in prepaid expenses and other 114 156
Noncurrent Assets:    
Restricted cash included in other noncurrent assets 283 0
Total cash, cash equivalents and restricted cash equivalents $ 4,507 $ 2,824