Statements of Consolidated Stockholder's Equity (USD $) In Millions	Total		United Airlines, Inc.	Common Stock	Additional Capital Invested	Additional Capital Invested United Airlines, Inc.	Treasury Stock	Accumulated Deficit	Accumulated Deficit United Airlines, Inc.	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) United Airlines, Inc.	Receivable from Related Parties, Net United Airlines, Inc.
Beginning Balance at Dec. 31, 2011	$ 1,806		$ 2,419	$ 3	$ 7,114	$ 7,580	$ (31)	$ (4,863)	$ (4,736)	$ (417)	$ (425)
Beginning Balance (in shares) at Dec. 31, 2011				331
Net income (loss)	(723)		(661)					(723)	(661)
Other comprehensive income (loss)	(629)	[1]	(628)							(629)	(628)
Share-based compensation	14		14		14	14
Proceeds from exercise of stock options (in shares)				1
Proceeds from exercise of stock options	17				17
UAL contribution related to stock plans			17			17
Other	(4)						(4)
Ending Balance at Dec. 31, 2012	481		1,161	3	7,145	7,611	(35)	(5,586)	(5,397)	(1,046)	(1,053)
Ending Balance (in shares) at Dec. 31, 2012				332
Net income (loss)	571		654					571	654
Other comprehensive income (loss)	1,654	[1]	1,661							1,654	1,661
Convertible debt redemption (in shares)				28
Convertible debt redemption	241			1	240
Income taxes			(68)			(68)
Contribution of asset by UAL			7			7
Share-based compensation	11		11		11	11
Proceeds from exercise of stock options (in shares)				2
Proceeds from exercise of stock options	29				29
UAL contribution related to stock plans			29			29
Other	(3)		(232)				(3)					(232)
Ending Balance at Dec. 31, 2013	2,984		3,223	4	7,425	7,590	(38)	(5,015)	(4,743)	608	608	(232)
Ending Balance (in shares) at Dec. 31, 2013				362
Net income (loss)	1,132		1,114					1,132	1,114
Other comprehensive income (loss)	(1,687)	[1]	(1,687)							(1,687)	(1,687)
Convertible debt redemption (in shares)				17
Convertible debt redemption	260		156		260	156
Repurchase of convertible debt	(34)				(34)
Dividend and other capital distributions to UAL			(236)			(469)			1			232
Share-based compensation	10		10		10	10
Proceeds from exercise of stock options (in shares)				2
Proceeds from exercise of stock options	60				60
UAL contribution related to stock plans			60			60
Repurchases of common stock	(320)						(320)
Repurchases of common stock (in shares)				(6)
Other	(9)		(5)				(9)					(5)
Ending Balance at Dec. 31, 2014	$ 2,396		$ 2,635	$ 4	$ 7,721	$ 7,347	$ (367)	$ (3,883)	$ (3,628)	$ (1,079)	$ (1,079)	$ (5)
Ending Balance (in shares) at Dec. 31, 2014				375

[1] UAL and United amounts are substantially the same except for an additional $6 million of income tax benefit at United in 2013. In addition, United had additional gains related to investments and other of $1 million in both 2012 and 2013.