Statements of Consolidated Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income (loss)	$ 469	$ 339	$ 52	$ (109)
Other comprehensive income (loss), net:
Net change related to fuel derivative financial instruments	(10)	(224)	(10)	(100)
Net change related to employee benefit plans	459	5	480	9
Net change related to investments and other	9		7	9
Comprehensive income (loss) adjustments, before tax	458	(219)	477	(82)
Total comprehensive income (loss), net	927	120	529	(191)
United Airlines, Inc.
Net income (loss)	484	369	122	(62)
Other comprehensive income (loss), net:
Net change related to fuel derivative financial instruments	(10)	(224)	(10)	(100)
Net change related to employee benefit plans	459	5	480	9
Net change related to investments and other	9	(1)	8	9
Other			6
Comprehensive income (loss) adjustments, before tax	458	(220)	484	(82)
Total comprehensive income (loss), net	$ 942	$ 149	$ 606	$ (144)