Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 1,814	$ 2,762
Short-term investments	825	487
Accounts receivable, net of an allowance for uncollectible accounts of $12 and $15 at December 31, 2017 and 2016, respectively	2,377	2,064
Fuel inventory	916	519
Expendable parts and supplies inventories, net of an allowance for obsolescence of $113 and $110 at December 31, 2017 and 2016, respectively	413	372
Prepaid expenses and other	1,499	1,247
Total current assets	7,844	7,451
Property and Equipment, Net:
Property and equipment, net of accumulated depreciation and amortization of $14,097 and $12,456 at December 31, 2017 and 2016, respectively	26,563	24,375
Other Assets:
Goodwill	9,794	9,794
Identifiable intangibles, net of accumulated amortization of $845 and $828 at December 31, 2017 and 2016, respectively	4,847	4,844
Deferred income taxes, net	935	3,064
Other noncurrent assets	3,309	1,733
Total other assets	18,885	19,435
Total assets	53,292	51,261
Current Liabilities:
Current maturities of long-term debt and capital leases	2,242	1,131
Air traffic liability	4,888	4,626
Accounts payable	3,674	2,572
Accrued salaries and related benefits	3,022	2,924
Frequent flyer deferred revenue	1,822	1,648
Fuel card obligation	1,067	431
Other accrued liabilities	1,858	1,907
Total current liabilities	18,573	15,239
Noncurrent Liabilities:
Long-term debt and capital leases	6,592	6,201
Pension, postretirement and related benefits	9,810	13,378
Frequent flyer deferred revenue	2,296	2,278
Other noncurrent liabilities	2,111	1,878
Total noncurrent liabilities	20,809	23,735
Commitments and Contingencies
Stockholders' Equity:
Common stock at $0.0001 par value; 1,500,000,000 shares authorized, 714,674,160 and 744,886,938 shares issued at December 31, 2017 and 2016, respectively	0	0
Additional paid-in capital	12,053	12,294
Retained earnings	9,636	7,903
Accumulated other comprehensive loss	(7,621)	(7,636)
Treasury stock, at cost, 7,476,181 and 14,149,229 shares at December 31, 2017 and 2016, respectively	(158)	(274)
Total stockholders' equity	13,910	12,287
Total liabilities and stockholders' equity	$ 53,292	$ 51,261