CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net Income	$ 1,034	$ 814	$ 848
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	372	363	320
Stock-based compensation and other	55	26	25
Changes in certain assets and liabilities:
Changes in deferred tax provision	19	94	56
(Increase) decrease in accounts receivable	(39)	(46)	47
Increase (decrease) in air traffic liability	88	9	38
Increase (decrease) in deferred revenue	63	83	57
Changes in pension and other postretirement benefits	17	23	36
Other—net	(19)	20	157
Net cash provided by operating activities	1,590	1,386	1,584
Property and equipment additions:
Aircraft and aircraft purchase deposits	(804)	(528)	(681)
Other flight equipment	(96)	(53)	(79)
Other property and equipment	(126)	(97)	(71)
Total property and equipment additions	(1,026)	(678)	(831)
Acquisition of Virgin America, net of cash acquired	0	(1,951)	0
Purchases of marketable securities	(1,569)	(960)	(1,327)
Sales and maturities of marketable securities	1,388	962	1,175
Proceeds from disposition of assets and changes in restricted deposits	75	5	53
Net cash used in investing activities	(1,132)	(2,622)	(930)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net of issuance costs	0	2,044	0
Long-term debt payments	(397)	(249)	(116)
Common stock repurchases	(75)	(193)	(505)
Cash dividend paid	(148)	(136)	(102)
Other financing activities	28	25	35
Net cash provided by (used in) financing activities	(592)	1,491	(688)
Net increase (decrease) in cash and cash equivalents	(134)	255	(34)
Cash and cash equivalents at beginning of year	328	73	107
Cash and cash equivalents at end of year	194	328	73
Cash paid during the year for:
Interest, net of amount capitalized	84	24	8
Income taxes, net of refunds received	$ 177	$ 459	$ 349