Earnings Per Share (Computation of Earnings per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net income	$ 538	$ 273	$ 325	$ 191
Less: Income allocable to participating securities	(2)		(1)
Earnings available to common stockholders	536	273	324	191
Basic weighted average shares outstanding	330	168	329	168
Earnings per share, basic	$ 1.63	$ 1.62	$ 0.98	$ 1.14
Earnings available to common stockholders including the effect of dilutive securities	558	303	337	201
Diluted weighted average shares outstanding	400	235	383	209
Earnings per share, diluted	$ 1.39	$ 1.29	$ 0.88	$ 0.96
UAL 4.5% Senior Limited Subordination Convertible Notes [Member]
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Effect of convertible notes on basic earnings per share, amount	11	21
Effect of convertible notes on basic earnings per share, shares	13	22
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Continental 4.5% Convertible Notes [Member]
Effect of convertible notes on basic earnings per share, amount	2		4
Effect of convertible notes on basic earnings per share, shares	12		12
UAL 5% Senior Convertible Notes [Member]
Interest rate of senior notes			5.00%
Effect of convertible notes on basic earnings per share, amount		4
Effect of convertible notes on basic earnings per share, shares		3
Dilutive shares excluded from diluted per share amounts				3
Continental 6% Convertible Junior Subordinated Debentures [Member]
Effect of convertible notes on basic earnings per share, amount	4
Effect of convertible notes on basic earnings per share, shares	4
Dilutive shares excluded from diluted per share amounts			4
UAL 6% Senior Convertible Notes [Member]
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Effect of convertible notes on basic earnings per share, amount	$ 5	$ 5	$ 9	$ 10
Effect of convertible notes on basic earnings per share, shares	40	40	40	40
Restricted Shares And Units And Stock Options [Member]
Effect of employee stock options	1	2	2	1
Restricted Stock And Stock Options [Member]
Dilutive shares excluded from diluted per share amounts	7	5	6	6

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-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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