CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 105	$ 194
Marketable securities	1,131	1,427
Total cash and marketable securities	1,236	1,621
Receivables—less allowance for doubtful accounts of $1 and $1	366	341
Inventories and supplies—net	60	57
Prepaid expenses and other current assets	125	133
Total Current Assets	1,787	2,152
Property and Equipment
Aircraft and other flight equipment	8,221	7,559
Other property and equipment	1,363	1,222
Deposits for future flight equipment	439	494
Property and Equipment	10,023	9,275
Less accumulated depreciation and amortization	3,242	2,991
Total Property and Equipment—Net	6,781	6,284
Other Assets
Goodwill	1,943	1,943
Intangible assets—net	127	133
Other noncurrent assets	274	234
Total Other Assets	2,344	2,310
Total Assets	10,912	10,746
Current Liabilities
Accounts payable	132	120
Accrued wages, vacation and payroll taxes	415	418
Air traffic liability	788	806
Other accrued liabilities	416	400
Current portion of long-term debt	486	307
Deferred Revenue, Current	705	635
Total Current Liabilities	2,942	2,686
Long-Term Debt, Net of Current Portion	1,617	2,262
Other Liabilities and Credits
Deferred income taxes	512	370
Deferred revenue	1,169	1,090
Obligation for pension and postretirement medical benefits	503	453
Other liabilities	418	425
Total Other Liabilities and Credits	2,602	2,338
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: 2018 - 130,813,476 shares; 2017 - 129,903,498 shares, Outstanding: 2018 - 123,194,430 shares; 2017 - 123,060,638 shares	1	1
Capital in excess of par value	232	164
Treasury stock (common), at cost: 2018 - 7,619,046 shares; 2017 - 6,842,860 shares	(568)	(518)
Accumulated other comprehensive loss	(448)	(380)
Retained earnings	4,534	4,193
Shareholders' Equity Total	3,751	3,460
Total Liabilities and Shareholders' Equity	$ 10,912	$ 10,746

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).