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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net Cash Provided by Operating Activities    
Net Cash Provided by Operating Activities $ 2,378 $ 2,408
Property and equipment additions:    
Flight equipment, including advance payments (987) (883)
Ground property and equipment, including technology (237) (310)
Redemption of short-term investments 0 546
Other, net 0 10
Net cash used in investing activities (1,224) (637)
Cash Flows from Financing Activities:    
Payments on debt and finance lease obligations (531) (712)
Cash dividends (99) (64)
Other, net (4) (11)
Net cash used in financing activities (634) (787)
Net Increase in Cash, Cash Equivalents and Restricted Cash Equivalents 520 984
Cash, cash equivalents and restricted cash equivalents at beginning of period 3,421 3,395
Cash, cash equivalents and restricted cash equivalents at end of period 3,941 4,379
Non-Cash Transactions:    
Right-of-use assets acquired or modified under operating leases 75 (34)
Flight and ground equipment acquired or modified under finance leases 0 6
Operating leases converted to finance leases 149 0
Current Assets:    
Cash and cash equivalents 3,711 3,877
Restricted cash included in prepaid expenses and other 89 126
Noncurrent Assets:    
Restricted cash included in other noncurrent assets 141 376
Total cash, cash equivalents and restricted cash equivalents $ 3,941 $ 4,379