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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash Flows From Operating Activities:      
Net income $ 3,457 $ 4,609 $ 1,318
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 2,513 2,341 2,107
Deferred income taxes 1,155 980 591
(Gain)/loss on fair value investments 323 (1,283) 874
Pension, postretirement and postemployment payments greater than expense (296) (121) (453)
Changes in certain assets and liabilities:      
Receivables (126) (7) (728)
Prepaids and other current assets (241) 137 (1,026)
Profit sharing 6 821 455
Other payables, deferred revenue and accrued liabilities 614 (285) 1,226
Other, net 163 (50) (227)
Net cash provided by operating activities 8,025 6,464 6,363
Property and equipment additions:      
Flight equipment, including advance payments (3,914) (3,645) (4,495)
Ground property and equipment, including technology (1,226) (1,678) (1,871)
Purchase of equity investments 0 (152) (870)
Purchase of short-term investments 0 (2,312) (2,704)
Redemption of short-term investments 1,137 4,547 2,804
Other, net 264 92 212
Net cash used in investing activities (3,739) (3,148) (6,924)
Cash Flows From Financing Activities:      
Proceeds from long-term obligations 0 878 0
Payments on debt and finance lease obligations (3,953) (4,071) (4,475)
Cash dividends (321) (128) 0
Other, net 14 (73) (60)
Net cash used in financing activities (4,260) (3,394) (4,535)
Net Increase/(Decrease) in Cash, Cash Equivalents and Restricted Cash 26 (78) (5,096)
Cash, cash equivalents and restricted cash at beginning of period 3,395 3,473 8,569
Cash, cash equivalents and restricted cash at end of period 3,421 3,395 3,473
Supplemental Disclosure of Cash Paid for Interest 1,001 1,164 1,261
Non-Cash Transactions:      
Right-of-use assets acquired or modified under operating leases 327 661 531
Flight and ground equipment acquired or modified under finance leases (17) 31 91
Operating leases converted to finance leases 25 84 342
Equity investments and other financings 0 0 330
Air traffic liability      
Changes in certain assets and liabilities:      
Liabilities and deferred revenue 50 (1,216) 1,902
Loyalty program deferred revenue      
Changes in certain assets and liabilities:      
Liabilities and deferred revenue $ 407 $ 538 $ 324