CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 144	$ 328
Marketable securities	1,596	1,252
Total cash and marketable securities	1,740	1,580
Receivables—net	301	302
Inventories and supplies—net	57	47
Prepaid expenses and other current assets	116	121
Total Current Assets	2,214	2,050
Property and Equipment
Aircraft and other flight equipment	7,590	6,947
Other property and equipment	1,187	1,103
Deposits for future flight equipment	531	545
Property and Equipment Total	9,308	8,595
Less accumulated depreciation and amortization	3,078	2,929
Total Property and Equipment—Net	6,230	5,666
Goodwill	1,934	1,934
Intangible assets	135	143
Other noncurrent assets	226	169
Other Assets	2,295	2,246
Total Assets	10,739	9,962
Current Liabilities
Accounts payable	97	92
Accrued wages, vacation and payroll taxes	345	397
Air traffic liability	1,103	849
Other accrued liabilities	886	878
Current portion of long-term debt	334	319
Total Current Liabilities	2,765	2,535
Long-Term Debt, Net of Current Portion	2,367	2,645
Other Liabilities and Credits
Deferred income taxes	682	463
Deferred revenue	682	640
Obligation for pension and postretirement medical benefits	323	331
Other liabilities	429	417
Other Liabilities and Credits Totals	2,116	1,851
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: 400,000,000 shares, Issued: 2017 - 129,860,836 shares; 2016 - 129,189,634 shares, Outstanding: 2017 - 123,387,158 shares; 2016 - 123,328,051 shares	1	1
Capital in excess of par value	156	110
Treasury stock (common), at cost: 2017 - 6,473,678 shares; 2016 - 5,861,583 shares	(494)	(443)
Accumulated other comprehensive loss	(289)	(305)
Retained earnings	4,117	3,568
Total Shareholders' Equity	3,491	2,931
Total Liabilities and Shareholders' Equity	$ 10,739	$ 9,962