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Quarterly Financial Data (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010	Mar. 31, 2010	Dec. 31, 2009
Quarterly Financial Data [Line Items]
Currency remeasurement loss		$ (31)		$ (53)
Impairment charge			28
Restructuring charges and special items	768
Restructuring charges related to the impairment	725				42
Minimum [Member]
Quarterly Financial Data [Line Items]
Foreign currency exchange rate remeasurement				2.15
Maximum [Member]
Quarterly Financial Data [Line Items]
Foreign currency exchange rate remeasurement				4.30
Aircraft And Gates [Member]
Quarterly Financial Data [Line Items]
Revenue reduction as a result of changes in assumptions	$ 43

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- Definition

Aggregate realized and unrealized loss on foreign currency transactions included in net income. Includes loss on a foreign currency forward exchange contract. Does not include foreign currency transactions designated as hedges of net investment in a foreign entity or intercompany foreign currency transactions that are of a long-term nature. Gross of tax effect.

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