Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Net Cash Provided by Operating Activities
Net Cash Provided by Operating Activities	$ 5,223	$ 4,270
Property and equipment additions:
Flight equipment, including advance payments	(2,226)	(2,263)
Ground property and equipment, including technology	(694)	(580)
Purchase of short-term investments	0	(118)
Redemption of short-term investments	206	421
Purchase of equity investments	(89)	0
Other, net	132	70
Net cash used in investing activities	(2,671)	(2,470)
Cash Flows from Financing Activities:
Payments on long-term debt and finance lease obligations	(2,450)	(2,093)
Repurchase of common stock	(1,593)	(925)
Cash dividends	(461)	(430)
Proceeds from short-term obligations	1,750	0
Proceeds from long-term obligations	500	3,124
Other, net	(17)	(69)
Net cash used in financing activities	(2,271)	(393)
Net Increase in Cash, Cash Equivalents and Restricted Cash Equivalents	281	1,407
Cash, cash equivalents and restricted cash equivalents at beginning of period	2,748	1,853
Cash, cash equivalents and restricted cash equivalents at end of period	3,029	3,260
Non-Cash Transactions:
Right-of-use assets acquired under operating leases	357	576
Operating leases converted to finance leases	189	0
Flight and ground equipment acquired under finance leases	$ 158	$ 33