Condensed Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 1,741	$ 1,355
Short-term investments	1,757	1,797
Accounts and other receivables	457	419
Inventories of parts and supplies, at cost	438	467
Deferred income taxes	180	168
Prepaid expenses and other current assets	241	250
Total current assets	4,814	4,456
Property and equipment, at cost:
Flight equipment	17,107	16,937
Ground property and equipment	2,716	2,666
Deposits on flight equipment purchase contracts	762	764
AssetsConstructedForOthers	478	453
Property and equipment, at cost	21,063	20,820
Less allowance for depreciation and amortization	7,643	7,431
Property and equipment, net	13,420	13,389
Goodwill	970	970
Other assets	772	530
Total assets	19,976	19,345
Current liabilities:
Accounts payable	1,299	1,247
Accrued liabilities	1,168	1,229
Air traffic liability	3,332	2,571
Long-term Debt and Capital Lease Obligations, Current	642	629
Total current liabilities	6,441	5,676
Long-term debt less current maturities	2,172	2,191
Deferred income taxes	2,997	2,934
Construction obligation	450	437
Other noncurrent liabilities	726	771
Stockholders' equity:
Common stock	808	808
Capital in excess of par value	1,256	1,231
Retained earnings	6,555	6,431
Accumulated other comprehensive loss	(12)	(3)
Treasury stock, at cost	(1,417)	(1,131)
Total stockholders' equity	7,190	7,336
Total liabilities and stockholders' equity	$ 19,976	$ 19,345