CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 183	$ 328
Marketable securities	1,527	1,252
Total cash and marketable securities	1,710	1,580
Receivables—net	321	302
Inventories and supplies—net	50	47
Prepaid expenses and other current assets	132	121
Total Current Assets	2,213	2,050
Property and Equipment
Aircraft and other flight equipment	7,137	6,947
Other property and equipment	1,139	1,103
Deposits for future flight equipment	541	545
Property and Equipment Total	8,817	8,595
Less accumulated depreciation and amortization	3,008	2,929
Total Property and Equipment—Net	5,809	5,666
Goodwill	1,942	1,934
Intangible assets	139	143
Other noncurrent assets	199	169
Other Assets	2,280	2,246
Total Assets	10,302	9,962
Current Liabilities
Accounts payable	95	92
Accrued wages, vacation and payroll taxes	281	397
Air traffic liability	1,218	849
Other accrued liabilities	909	878
Current portion of long-term debt	332	319
Total Current Liabilities	2,835	2,535
Long-Term Debt, Net of Current Portion	2,531	2,645
Other Liabilities and Credits
Deferred income taxes	509	463
Deferred revenue	641	640
Obligation for pension and postretirement medical benefits	334	331
Other liabilities	438	417
Other Liabilities and Credits Totals	1,922	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: 200,000,000 shares, Issued: 2017 - 129,590,771 shares; 2016 - 129,189,634 shares, Outstanding: 2017 - 123,729,188 shares; 2016 - 123,328,051 shares	1	1
Capital in excess of par value	126	110
Treasury stock (common), at cost: 2017 - 5,861,583 shares; 2016 - 5,861,583 shares	(443)	(443)
Accumulated other comprehensive loss	(299)	(305)
Retained earnings	3,629	3,568
Total Shareholders' Equity	3,014	2,931
Total Liabilities and Shareholders' Equity	$ 10,302	$ 9,962