Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current Assets
Allowance for uncollectible accounts	$ 43	$ 51
Allowance for obsolescence	503	530
Other Assets
Accumulated amortization on domestic slots and airport operating and gate lease rights	$ 508	$ 486
Stockholders' Equity (Deficit)
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	1,000	1,000
Common stock, shares issued	1,000	1,000
Common Stock, Shares, Outstanding	1,000	1,000