CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 122	$ 102
Marketable securities	1,130	1,039
Total cash and marketable securities	1,252	1,141
Receivables - less allowance for doubtful accounts of $0 and $1	130	136
Inventories and supplies - net	58	44
Deferred income taxes	148	134
Fuel hedge contracts	26	47
Prepaid expenses and other current assets	123	94
Total Current Assets	1,737	1,596
Property and Equipment
Aircraft and other flight equipment	4,248	4,042
Other property and equipment	855	762
Deposits for future flight equipment	369	234
Property and Equipment Total	5,472	5,038
Less accumulated depreciation and amortization	1,863	1,665
Total Property and Equipment - Net	3,609	3,373
Fuel Hedge Contracts	39	70
Other Assets	120	128
Total Assets	5,505	5,167
Current Liabilities
Accounts payable	65	104
Accrued aircraft rent	18	32
Accrued wages, vacation and payroll taxes	184	164
Other accrued liabilities	539	513
Air traffic liability	534	489
Current portion of long-term debt	161	208
Total Current Liabilities	1,501	1,510
Long-Term Debt, Net of Current Portion	871	1,099
Other Liabilities and Credits
Deferred income taxes	446	363
Deferred revenue	443	410
Obligation for pension and postretirement medical benefits	489	463
Other liabilities	334	148
Other Liabilities and Credits Totals	1,712	1,384
Commitments and Contingencies
Shareholders' Equity
Preferred stock, $1 par value Authorized: 5,000,000 shares, none issued or outstanding	0	0
Common stock, $1 par value Authorized: 100,000,000 shares, Issued: 2012 - 70,376,543 shares; 2011 - 75,733,044 shares	70	76
Capital in excess of par value	660	802
Treasury stock (common), at cost: 2012 - 0 shares; 2011 - 4,783,494 shares	0	(125)
Accumulated other comprehensive loss	(436)	(390)
Retained earnings	1,127	811
Shareholders' Equity Total	1,421	1,174
Total Liabilities and Shareholders' Equity	$ 5,505	$ 5,167