CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 57	$ 122
Marketable securities	1,372	1,130
Total cash and marketable securities	1,429	1,252
Receivables - net	195	130
Inventories and supplies - net	59	58
Deferred income taxes	175	148
Fuel hedge contracts	14	26
Prepaid expenses and other current assets	114	123
Total Current Assets	1,986	1,737
Property and Equipment
Aircraft and other flight equipment	4,405	4,248
Other property and equipment	867	855
Deposits for future flight equipment	443	369
Property and Equipment Total	5,715	5,472
Less accumulated depreciation and amortization	1,990	1,863
Total Property and Equipment - Net	3,725	3,609
Fuel Hedge Contracts	13	39
Other Assets	128	120
Total Assets	5,852	5,505
Current Liabilities
Accounts payable	71	65
Accrued wages, vacation and payroll taxes	140	184
Other accrued liabilities	711	557
Air traffic liability	724	534
Current portion of long-term debt	110	161
Total Current Liabilities	1,756	1,501
Long-Term Debt, Net of Current Portion	814	871
Other Liabilities and Credits
Deferred income taxes	496	446
Deferred revenue	455	443
Obligation for pension and postretirement medical benefits	470	489
Other liabilities	318	334
Other Liabilities and Credits Totals	1,739	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 - 70,009,327 shares; 2012 - 70,376,543 shares	70	70
Capital in excess of par value	629	660
Accumulated other comprehensive (loss)	(424)	(436)
Retained earnings	1,268	1,127
Total Shareholders' Equity	1,543	1,421
Total Liabilities and Shareholders' Equity	$ 5,852	$ 5,505