Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 1,447	$ 1,814
Short-term investments	523	825
Accounts receivable, net of an allowance for uncollectible accounts of $13 and $12 at March 31, 2018 and December 31, 2017, respectively	2,568	2,377
Fuel inventory	723	916
Expendable parts and supplies inventories, net of an allowance for obsolescence of $119 and $113 at March 31, 2018 and December 31, 2017, respectively	423	413
Prepaid expenses and other	2,040	1,499
Total current assets	7,724	7,844
Property and Equipment, Net:
Property and equipment, net of accumulated depreciation and amortization of $14,585 and $14,097 at March 31, 2018 and December 31, 2017, respectively	27,096	26,563
Other Assets:
Goodwill	9,794	9,794
Identifiable intangibles, net of accumulated amortization of $849 and $845 at March 31, 2018 and December 31, 2017, respectively	4,843	4,847
Deferred income taxes, net	1,175	1,354
Other noncurrent assets	3,446	3,309
Total other assets	19,258	19,304
Total assets	54,078	53,711
Current Liabilities:
Current maturities of long-term debt and capital leases	2,289	2,242
Air traffic liability	6,233	4,364
Accounts payable	3,351	3,674
Accrued salaries and related benefits	1,915	3,022
Frequent flyer deferred revenue	2,758	2,762
Fuel card obligation	1,062	1,067
Other accrued liabilities	2,404	1,868
Total current liabilities	20,012	18,999
Noncurrent Liabilities:
Long-term debt and capital leases	6,360	6,592
Pension, postretirement and related benefits	9,193	9,810
Frequent flyer deferred revenue	3,636	3,559
Other noncurrent liabilities	2,320	2,221
Total noncurrent liabilities	21,509	22,182
Commitments and Contingencies
Stockholders' Equity:
Common stock at $0.0001 par value; 1,500,000,000 shares authorized, 710,603,639 and 714,674,160 shares issued at March 31, 2018 and December 31, 2017, respectively	0	0
Additional paid-in capital	11,967	12,053
Retained earnings	8,465	8,256
Accumulated other comprehensive loss	(7,681)	(7,621)
Treasury stock, at cost, 8,125,434 and 7,476,181 shares at March 31, 2018 and December 31, 2017, respectively	(194)	(158)
Total stockholders' equity	12,557	12,530
Total liabilities and stockholders' equity	$ 54,078	$ 53,711