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Hedging Activities (Description Of Derivative Instruments) (Details) (UAL [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
UAL [Member]
Derivatives, Fair Value [Line Items]
Fuel contracts due within one year, Assets	$ 206	$ 77
Fuel contracts due within one year, Liabilities		$ 4

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details