Hedging Activities (Schedule Of Derivative Credit Risk And Fair Value) (Details) (UAL [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2012
UAL [Member]
Net derivative asset with counterparties	$ 206
Collateral held by the Company	1
Potential loss related to the failure of the Company's counterparties to perform	$ 205

Maximum amount the entity would be obligated to pay on the credit risk derivatives upon occurrence of a credit event.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 15A, 15B, 15C, 15D

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4K

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5708775-113959

Name:	us-gaap_MaximumPotentialFutureExposureOnCreditRiskDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant