Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 67	$ 193	$ 204	$ 717
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	438	375	1,250	1,107
Unrealized mark-to-market adjustment on available for sale securities	0	0	0	(4)
Unrealized/realized gain (loss) on fuel derivative instruments	15	(21)	17	(14)
Deferred income taxes	19	57	62	214
Changes in certain assets and liabilities:
Accounts and other receivables	193	(216)	(80)	(405)
Other assets	(13)	(35)	4	74
Accounts payable and accrued liabilities	(196)	352	(1,668)	645
Air traffic liability	(377)	(59)	421	750
Other liabilities	(18)	(89)	(136)	(180)
Cash collateral received from (provided to) derivative counterparties	(8)	40	(28)	(6)
Other, net	(7)	19	(60)	(159)
Net cash provided by (used in) operating activities	113	616	(14)	2,739
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(517)	(842)	(1,594)	(2,812)
Assets constructed for others	(10)	(8)	(26)	(23)
Purchases of short-term investments	(636)	(1,620)	(3,845)	(5,347)
Proceeds from sales of short-term and other investments	1,621	2,406	5,160	5,914
Other, net	0	0	(29)	0
Net cash provided by (used in) investing activities	458	(64)	(334)	(2,268)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payroll Support Program stock warrants repurchase	0	0	(6)	0
Proceeds from Employee stock plans	15	13	46	36
Payments of long-term debt and finance lease obligations	(11)	(11)	(27)	(78)
Payments of cash dividends	(216)	(214)	(431)	(428)
Other, net	2	(1)	(19)	4
Net cash used in financing activities	(210)	(213)	(437)	(466)
NET CHANGE IN CASH AND CASH EQUIVALENTS	361	339	(785)	5
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	8,142	9,158	9,288	9,492
CASH AND CASH EQUIVALENTS AT END OF PERIOD	8,503	9,497	8,503	9,497
CASH PAYMENTS FOR:
Interest, net of amount capitalized	14	19	124	134
Income taxes	0	1	7	9
SUPPLEMENTAL DISCLOSURE OF NON-CASH TRANSACTIONS:
Right-of-use assets acquired or modified under operating leases	23	9	42	78
Flight and ground equipment acquired or modified under finance leases	$ 17	$ 0	$ 16	$ 0