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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net income $ 683 $ 760 $ 524 $ 482
Adjustments to reconcile net income to cash provided by operating activities:        
Depreciation and amortization 367 325 731 649
Impairment of long-lived assets 0 15 0 31
Unrealized mark-to-market adjustment on available for sale securities 0 4 (4) 7
Unrealized/realized (gain) loss on fuel derivative instruments 6 (20) 6 15
Deferred income taxes 209 272 157 174
Loss on extinguishment of debt 0 43 0 116
Changes in certain assets and liabilities:        
Accounts and other receivables 44 439 (188) 105
Other assets 58 (1) 109 (45)
Accounts payable and accrued liabilities 364 328 293 506
Air traffic liability (137) (92) 809 793
Other liabilities (44) (103) (90) (209)
Cash collateral received from (provided to) derivative counterparties (16) (101) (46) 284
Other, net (118) 37 (178) 69
Net cash provided by operating activities 1,416 1,906 2,123 2,977
CASH FLOWS FROM INVESTING ACTIVITIES:        
Capital expenditures (925) (987) (1,971) (1,497)
Assets constructed for others (8) (3) (14) (6)
Purchases of short-term investments (1,522) (1,545) (3,727) (2,470)
Proceeds from sales of short-term and other investments 1,828 980 3,508 2,280
Net cash used in investing activities (627) (1,555) (2,204) (1,693)
CASH FLOWS FROM FINANCING ACTIVITIES:        
Proceeds from Employee stock plans 14 13 22 19
Payments of long-term debt and finance lease obligations (8) (53) (67) (146)
Payments of cash dividends 0 0 (214) 0
Payments for repurchases and conversions of convertible debt 0 (178) 0 (409)
Other, net 4 3 6 6
Net cash provided by (used in) financing activities 10 (215) (253) (530)
NET CHANGE IN CASH AND CASH EQUIVALENTS 799 136 (334) 754
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 8,359 13,098 9,492 12,480
CASH AND CASH EQUIVALENTS AT END OF PERIOD 9,158 13,234 9,158 13,234
CASH PAYMENTS FOR:        
Interest, net of amount capitalized 96 141 115 161
Income taxes 6 7 8 11
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS:        
Adoption of Accounting Standards Update 2020-06, Debt 0 0 0 245
Right-of-use assets acquired under operating leases $ 22 $ 3 $ 69 $ 27