Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net Cash Provided by Operating Activities
Net Cash Provided by Operating Activities	$ 4,150	$ 1,539
Property and equipment additions:
Flight equipment, including advance payments	(2,263)	(1,292)
Ground property and equipment, including technology	(583)	(498)
Purchase of equity investments	0	(622)
Purchase of short-term investments	(118)	(567)
Redemption of short-term investments	421	307
Other, net	71	6
Net cash used in investing activities	(2,472)	(2,666)
Cash Flows from Financing Activities:
Payments on long-term debt and capital lease obligations	(2,093)	(564)
Repurchase of common stock	(925)	(800)
Cash dividends	(430)	(297)
Fuel card obligation	(5)	341
Proceeds from long-term obligations	3,124	2,004
Other, net	58	(78)
Net cash (used in) provided by financing activities	(271)	606
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	1,407	(521)
Cash, cash equivalents and restricted cash at beginning of period	1,853	2,826
Cash, cash equivalents and restricted cash at end of period	3,260	2,305
Non-Cash Transactions:
Treasury stock contributed to our qualified defined benefit pension plans	0	350
Flight and ground equipment acquired under capital leases	57	208
Other Assets:
Total cash, cash equivalents and restricted cash	$ 1,853	$ 2,826