CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 41	$ 122
Marketable securities	1,404	1,130
Total cash and marketable securities	1,445	1,252
Receivables - net	182	130
Inventories and supplies - net	60	58
Deferred income taxes	123	148
Fuel hedge contracts	20	26
Prepaid expenses and other current assets	105	123
Total Current Assets	1,935	1,737
Property and Equipment
Aircraft and other flight equipment	4,419	4,248
Other property and equipment	857	855
Deposits for future flight equipment	550	369
Property and Equipment Total	5,826	5,472
Less accumulated depreciation and amortization	2,034	1,863
Total Property and Equipment - Net	3,792	3,609
Fuel Hedge Contracts	9	39
Other Assets	126	120
Total Assets	5,862	5,505
Current Liabilities
Accounts payable	60	65
Accrued wages, vacation and payroll taxes	176	184
Other accrued liabilities	676	557
Air traffic liability	627	534
Current portion of long-term debt	111	161
Total Current Liabilities	1,650	1,501
Long-Term Debt, Net of Current Portion	782	871
Other Liabilities and Credits
Deferred income taxes	554	446
Deferred revenue	295	443
Obligation for pension and postretirement medical benefits	461	489
Other liabilities	318	334
Other Liabilities and Credits Totals	1,628	1,712
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: 2013 - 69,991,221 shares; 2012 - 70,376,543 shares, Outstanding: 2013 - 69,650,542; 2012 - 70,376,543	70	70
Capital in excess of par value	625	660
Treasury stock (common), at cost: 2013 - 340,679 shares; 2012 - 0 shares	(21)	0
Accumulated other comprehensive (loss)	(414)	(436)
Retained earnings	1,542	1,127
Total Shareholders' Equity	1,802	1,421
Total Liabilities and Shareholders' Equity	$ 5,862	$ 5,505