Consolidated Balance Sheets Parenthetical (Parentheticals) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets, Current [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ (43)	$ (33)
Airline Related Inventory, Valuation Reserves	(106)	(101)
Property, Plant and Equipment [Abstract]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(5,797)	(5,472)
Other Assets [Abstract]
Finite-Lived Intangible Assets, Accumulated Amortization	$ (617)	$ (600)
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	1,500,000,000	1,500,000,000
Common Stock, Shares, Issued	865,986,926	861,499,734
Treasury Stock, Shares	16,378,734	16,253,791