Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net Cash Provided by Operating Activities
Net Cash Provided by Operating Activities	$ 2,408	$ 2,235
Property and equipment additions:
Flight equipment, including advance payments	(883)	(630)
Ground property and equipment, including technology	(310)	(370)
Purchase of short-term investments	0	(999)
Redemption of short-term investments	546	897
Other, net	10	2
Net cash used in investing activities	(637)	(1,100)
Cash Flows from Financing Activities:
Payments on debt and finance lease obligations	(712)	(1,166)
Cash dividends	(64)	0
Other, net	(11)	(13)
Net cash used in financing activities	(787)	(1,179)
Net Increase/(Decrease) in Cash, Cash Equivalents and Restricted Cash Equivalents	984	(44)
Cash, cash equivalents and restricted cash equivalents at beginning of period	3,395	3,473
Cash, cash equivalents and restricted cash equivalents at end of period	4,379	3,429
Non-Cash Transactions:
Right-of-use assets acquired or modified under operating leases	(34)	208
Flight and ground equipment acquired or modified under finance leases	6	25
Operating leases converted to finance leases	0	30
Current Assets:
Cash and cash equivalents	3,877	3,215
Restricted cash included in prepaid expenses and other	126	160
Noncurrent Assets:
Restricted cash included in other noncurrent assets	376	54
Total cash, cash equivalents and restricted cash equivalents	$ 4,379	$ 3,429