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Financial Instruments And Fair Value Measurements (Fair Value Assets Measured On Nonrecurring Basis) (Details) (UAL [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Carrying Amount	$ 11,421	$ 11,682
Fair Value	12,105	11,992
Level 2 [Member]
Fair Value	910	859
Level 3 [Member]
Fair Value	$ 11,195	$ 11,133

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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