Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 11,063	$ 2,548
Short-term investments	2,271	1,524
Accounts and other receivables	1,130	1,086
Inventories of parts and supplies, at cost	414	529
Prepaid expenses and other current assets	295	287
Total current assets	15,173	5,974
Property and equipment, at cost:
Flight equipment	20,877	21,629
Ground property and equipment	6,083	5,672
Deposits on flight equipment purchase contracts	305	248
Assets constructed for others	309	164
Property and equipment, at cost	27,574	27,713
Less allowance for depreciation and amortization	11,743	10,688
Property and equipment, net	15,831	17,025
Goodwill	970	970
Operating lease right-of-use assets	1,892	1,349
Total assets	34,588	25,895
Current liabilities:
Accounts payable	931	1,574
Accrued liabilities	2,259	1,749
Current operating lease liabilities	306	353
Air traffic liability	3,790	4,457
Current maturities of long-term debt	220	819
Total current liabilities	7,506	8,952
Long-term debt less current maturities	10,111	1,846
Air traffic liability - noncurrent	3,343	1,053
Deferred income taxes	1,634	2,364
Construction obligation	309	164
Noncurrent operating lease liabilities	1,562	978
Other noncurrent liabilities	1,247	706
Stockholders' equity:
Common stock, $1.00 par value: 2,000,000,000 shares authorized; 888,111,634 and 807,611,634 shares issued in 2020 and 2019 respectively	888	808
Capital in excess of par value	4,191	1,581
Retained earnings	14,777	17,945
Accumulated other comprehensive income (loss)	(105)	(61)
Treasury stock, at cost: 297,637,297 and 288,547,318 shares in 2020 and 2019 respectively	(10,875)	(10,441)
Total stockholders' equity	8,876	9,832
Total liabilities and stockholders' equity	$ 34,588	$ 25,895
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares issued (in shares)	888,111,634	807,611,634
Treasury stock, at cost: shares (in shares)	297,637,297	288,547,318