CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 73	$ 107
Marketable securities	1,255	1,110
Total cash and marketable securities	1,328	1,217
Receivables - less allowance for doubtful accounts of $1 and $1	212	259
Inventories and supplies - net	51	58
Prepaid expenses and other current assets	72	105
Total Current Assets	1,663	1,639
Property and Equipment
Aircraft and other flight equipment	5,690	5,165
Other property and equipment	955	896
Deposits for future flight equipment	771	555
Property and Equipment Total	7,416	6,616
Less accumulated depreciation and amortization	2,614	2,317
Total Property and Equipment - Net	4,802	4,299
Other Assets	68	126
Total Assets	6,533	6,064
Current Liabilities
Accounts payable	63	62
Accrued wages, vacation and payroll taxes	298	276
Other accrued liabilities	661	585
Air traffic liability	669	631
Current portion of long-term debt	115	117
Total Current Liabilities	1,806	1,671
Long-Term Debt, Net of Current Portion	571	686
Other Liabilities and Credits
Deferred income taxes	682	633
Deferred revenue	431	374
Obligation for pension and postretirement medical benefits	270	246
Other liabilities	362	327
Other Liabilities and Credits Totals	$ 1,745	$ 1,580
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: 2015 - 128,442,099 shares; 2014 - 131,556,573 shares, Outstanding: 2015 - 125,175,325 shares; 2014 - 131,481,473 shares	1	1
Capital in excess of par value	73	296
Treasury stock (common), at cost: 2015 - 3,266,774 shares; 2014 - 75,100 shares	(250)	(4)
Accumulated other comprehensive loss	(303)	(310)
Retained earnings	2,890	2,144
Shareholders' Equity Total	2,411	2,127
Total Liabilities and Shareholders' Equity	$ 6,533	$ 6,064