Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 367	$ 683	$ 137	$ 524
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation and amortization	404	367	812	731
Unrealized mark-to-market adjustment on available for sale securities	0	0	0	(4)
Unrealized/realized loss on fuel derivative instruments	1	6	2	6
Deferred income taxes	110	209	43	157
Changes in certain assets and liabilities:
Accounts and other receivables	34	44	(274)	(188)
Other assets	32	58	18	109
Accounts payable and accrued liabilities	(576)	364	(1,473)	293
Air traffic liability	(317)	(137)	798	809
Other liabilities	(45)	(44)	(117)	(90)
Cash collateral provided to derivative counterparties	(20)	(16)	(20)	(46)
Other, net	(13)	(118)	(54)	(178)
Net cash provided by (used in) operating activities	(23)	1,416	(128)	2,123
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(494)	(925)	(1,077)	(1,971)
Assets constructed for others	(6)	(8)	(16)	(14)
Purchases of short-term investments	(1,532)	(1,522)	(3,210)	(3,727)
Proceeds from sales of short-term and other investments	1,820	1,828	3,540	3,508
Other, net	6	0	(28)	0
Net cash used in investing activities	(206)	(627)	(791)	(2,204)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payroll Support Program stock warrants repurchase	(6)	0	(6)	0
Proceeds from Employee stock plans	15	14	30	22
Payments of long-term debt and finance lease obligations	(8)	(8)	(16)	(67)
Payments of cash dividends	0	0	(215)	(214)
Other, net	3	4	(20)	6
Net cash provided by (used in) financing activities	4	10	(227)	(253)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(225)	799	(1,146)	(334)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	8,367	8,359	9,288	9,492
CASH AND CASH EQUIVALENTS AT END OF PERIOD	8,142	9,158	8,142	9,158
CASH PAYMENTS FOR:
Interest, net of amount capitalized	92	96	110	115
Income taxes	4	6	7	8
SUPPLEMENTAL DISCLOSURE OF NON-CASH TRANSACTIONS:
Right-of-use assets acquired under operating leases	$ 6	$ 22	$ 21	$ 69