Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net Cash Provided by Operating Activities
Net Cash Provided by Operating Activities	$ 2,235	$ 1,771
Property and equipment additions:
Flight equipment, including advance payments	(630)	(1,276)
Ground property and equipment, including technology	(370)	(490)
Purchase of short-term investments	(999)	(226)
Redemption of short-term investments	897	1,346
Purchase of equity investments	0	(100)
Other, net	2	(3)
Net cash used in investing activities	(1,100)	(749)
Cash Flows from Financing Activities:
Payments on debt and finance lease obligations	(1,166)	(1,443)
Other, net	(13)	(13)
Net cash used in financing activities	(1,179)	(1,456)
Net Decrease in Cash, Cash Equivalents and Restricted Cash Equivalents	(44)	(434)
Cash, cash equivalents and restricted cash equivalents at beginning of period	3,473	8,569
Cash, cash equivalents and restricted cash equivalents at end of period	3,429	8,135
Non-Cash Transactions:
Flight and ground equipment acquired under finance leases	25	33
Right-of-use assets acquired under operating leases	208	359
Operating leases converted to finance leases	30	9
Equity investments and other financings	0	330
Current Assets:
Cash and cash equivalents	3,215	7,705
Restricted cash included in prepaid expenses and other	160	170
Noncurrent Assets:
Restricted cash included in other noncurrent assets	54	260
Total cash, cash equivalents and restricted cash equivalents	$ 3,429	$ 8,135