Condensed Consolidated Balance Sheet - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,822	$ 1,495
Short-term investments	1,421	1,778
Accounts and other receivables	680	662
Inventories of parts and supplies, at cost	430	420
Prepaid expenses and other current assets	448	460
Total current assets	4,801	4,815
Property and equipment, at cost:
Flight equipment	21,143	21,368
Ground property and equipment	4,506	4,399
Deposits on flight equipment purchase contracts	913	919
Assets constructed for others	1,607	1,543
Property and equipment, at cost	28,169	28,229
Less allowance for depreciation and amortization	9,396	9,690
Property and equipment, net	18,773	18,539
Goodwill	970	970
Other assets	959	786
Total assets	25,503	25,110
Current liabilities:
Accounts payable	1,243	1,320
Accrued liabilities	1,134	1,700
Accrued Liabilities		1,700
Air traffic liability	4,420	3,495
Current maturities of long-term debt	365	348
Total current liabilities	7,162	6,863
Long-term debt less current maturities	3,227	3,320
Air traffic liability - loyalty noncurrent	1,010	1,070
Deferred income taxes	2,216	2,119
Construction obligation	1,563	1,390
Other noncurrent liabilities	706	707
Stockholders' equity:
Common stock	808	808
Capital in excess of par value	1,452	1,451
Retained earnings	14,238	13,832
Accumulated other comprehensive income	78	12
Treasury stock, at cost	(6,957)	(6,462)
Total stockholders' equity	9,619	9,641
Total liabilities and stockholders' equity	$ 25,503	$ 25,110