Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 18,283	$ 11,269	$ 2,762
Short-term investments	123	414
Restricted cash	37	255
Receivables, less allowance for credit losses (2021—$28; 2020—$78)	1,663	1,295
Aircraft fuel, spare parts and supplies, less obsolescence allowance (2021—$546; 2020—$478)	983	932
Prepaid expenses and other	745	635
Total current assets	21,834	14,800
Operating property and equipment:
Flight equipment	39,584	38,218
Other property and equipment	8,764	8,511
Purchase deposits for flight equipment	2,215	1,166
Total operating property and equipment	50,563	47,895
Less—Accumulated depreciation and amortization	(18,489)	(16,429)
Total operating property and equipment, net	32,074	31,466
Operating lease right-of-use assets	4,645	4,537
Other assets:
Goodwill	4,527	4,527
Intangibles, less accumulated amortization (2021—$1,544; 2020—$1,495)	2,803	2,838
Restricted cash	213	218
Deferred income taxes	659	131
Notes receivable, less allowance for credit losses (2021—$622; 2020—$522)	76	31
Investments in affiliates and other, net	1,344	1,000
Total other assets	9,622	8,745
Total assets	68,175	59,548
Current liabilities:
Accounts payable	2,562	1,595
Accrued salaries and benefits	2,121	1,960
Advance ticket sales	6,354	4,833
Frequent flyer deferred revenue	2,239	908
Current maturities of long-term debt	3,002	1,911
Current maturities of other financial liabilities	834	18
Current maturities of operating leases	556	612
Current maturities of finance leases	76	182
Other	560	706
Total current liabilities	18,304	12,725
Long-term debt	30,361	24,836
Long-term obligations under operating leases	5,152	4,986
Long-term obligations under finance leases	219	224
Other liabilities and deferred credits:
Frequent flyer deferred revenue	4,043	5,067
Pension liability	1,920	2,460
Postretirement benefit liability	1,000	994
Other financial liabilities	863	1,140
Other	1,284	1,156
Total other liabilities and deferred credits	9,110	10,817
Commitments and contingencies
Stockholders' equity:
Preferred stock	0	0
Common stock	4	4
Additional capital invested	9,156	8,366
Stock held in treasury, at cost	(3,814)	(3,897)
Retained earnings	625	2,626
Accumulated other comprehensive loss	(942)	(1,139)
Total stockholders' equity	5,029	5,960	$ 11,531	$ 10,042
Total liabilities and stockholders' equity	$ 68,175	$ 59,548