CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 107	$ 80
Marketable securities	1,110	1,250
Total cash and marketable securities	1,217	1,330
Receivables - less allowance for doubtful accounts of $1 and $1	259	152
Inventories and supplies - net	58	60
Deferred income taxes	117	113
Prepaid expenses and other current assets	105	107
Total Current Assets	1,756	1,762
Property and Equipment
Aircraft and other flight equipment	5,165	4,677
Other property and equipment	896	838
Deposits for future flight equipment	555	446
Property and Equipment Total	6,616	5,961
Less accumulated depreciation and amortization	2,317	2,068
Total Property and Equipment - Net	4,299	3,893
Other Assets	126	183
Total Assets	6,181	5,838
Current Liabilities
Accounts payable	62	64
Accrued wages, vacation and payroll taxes	232	211
Other accrued liabilities	629	624
Air traffic liability	631	564
Current portion of long-term debt	117	117
Total Current Liabilities	1,671	1,580
Long-Term Debt, Net of Current Portion	686	754
Other Liabilities and Credits
Deferred income taxes	750	709
Deferred revenue	374	335
Obligation for pension and postretirement medical benefits	246	123
Other liabilities	327	308
Other Liabilities and Credits Totals	1,697	1,475
Commitments and Contingencies
Shareholders' Equity
Preferred stock, $0.01 par value Authorized: 5,000,000 shares, none issued or outstanding	0	0
Common stock, $0.01 par value Authorized: 200,000,000 shares, Issued: 2014 - 131,556,573 shares; 2013 - 137,533,382 shares, Outstanding: 2014 - 131,481,473 shares; 2013 - 137,491,906 shares	1	1
Capital in excess of par value	296	606
Treasury stock (common), at cost: 2014 - 75,100 shares; 2013 - 41,476 shares	(4)	(2)
Accumulated other comprehensive loss	(310)	(183)
Retained earnings	2,144	1,607
Shareholders' Equity Total	2,127	2,029
Total Liabilities and Shareholders' Equity	$ 6,181	$ 5,838