Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Cash Provided by Operating Activities
Net Cash Provided by Operating Activities	$ 3,230	$ 6,080
Property and equipment additions:
Flight equipment, including advance payments	(1,905)	(2,149)
Ground property and equipment, including technology	(826)	(448)
Purchase of equity investments	(795)	0
Purchase of short-term investments	(868)	(1,480)
Redemption of short-term investments	395	1,436
Other, net	(35)	41
Net cash used in investing activities	(4,034)	(2,600)
Cash Flows from Financing Activities:
Payments on long-term debt and capital lease obligations	(819)	(1,403)
Repurchase of common stock	(1,350)	(2,301)
Cash dividends	(516)	(360)
Fuel card obligation	341	(14)
Proceeds from long-term obligations	2,004	450
Other, net	(140)	(186)
Net cash used in financing activities	(480)	(3,814)
Net Decrease in Cash and Cash Equivalents	(1,284)	(334)
Cash and cash equivalents at beginning of period	2,762	1,972
Cash and cash equivalents at end of period	1,478	1,638
Non-Cash Transactions:
Treasury stock contributed to our qualified defined benefit pension plans	350	350
Flight and ground equipment acquired under capital leases	$ 249	$ 55