Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Cash (Used In) Provided by Operating Activities
Net Cash (Used In) Provided by Operating Activities	$ (801)	$ 1,011
Property and equipment additions:
Flight equipment, including advance payments	(595)	(764)
Ground property and equipment, including technology	(207)	(107)
Purchase of equity investments	(622)	0
Purchase of short-term investments	(463)	(488)
Redemption of short-term investments	207	753
Other, net	(54)	5
Net cash used in investing activities	(1,734)	(601)
Cash Flows from Financing Activities:
Payments on long-term debt and capital lease obligations	(288)	(459)
Repurchase of common stock	(200)	(775)
Cash dividends	(149)	(107)
Fuel card obligation	334	141
Proceeds from short-term obligations	0	68
Proceeds from long-term obligations	2,004	450
Other, net	(21)	8
Net cash provided by (used in) financing activities	1,680	(674)
Net Decrease in Cash and Cash Equivalents	(855)	(264)
Cash and cash equivalents at beginning of period	2,762	1,972
Cash and cash equivalents at end of period	1,907	1,708
Non-Cash Transactions:
Treasury stock contributed to our qualified defined benefit pension plans	350	350
Flight and ground equipment acquired under capital leases	$ 186	$ 27