Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 12,666	$ 11,269
Short-term investments	309	414
Restricted cash	254	255
Receivables, less allowance for credit losses (2021 — $74; 2020 — $78)	1,389	1,295
Aircraft fuel, spare parts and supplies, less obsolescence allowance (2021 — $502; 2020 — $478)	918	932
Prepaid expenses and other	483	635
Total current assets	16,019	14,800
Operating property and equipment:
Flight equipment	38,851	38,218
Other property and equipment	8,581	8,511
Purchase deposits for flight equipment	1,439	1,166
Total operating property and equipment	48,871	47,895
Less — Accumulated depreciation and amortization	(16,956)	(16,429)
Total operating property and equipment, net	31,915	31,466
Operating lease right-of-use assets	4,516	4,537
Other assets:
Goodwill	4,527	4,527
Intangibles, less accumulated amortization (2021 — $1,507; 2020 — $1,495)	2,840	2,838
Restricted cash	218	218
Deferred income taxes	520	131
Investments in affiliates and other, less allowance for credit losses (2021 — $526; 2020 — $522)	1,107	1,031
Total other assets	9,212	8,745
Total assets	61,662	59,548
Current liabilities:
Accounts payable	1,838	1,595
Accrued salaries and benefits	2,267	1,960
Advance ticket sales	5,502	4,833
Frequent flyer deferred revenue	1,251	908
Current maturities of long-term debt	1,783	1,911
Current maturities of operating leases	623	612
Current maturities of finance leases	179	182
Other	724	724
Total current liabilities	14,167	12,725
Long-term debt	25,849	24,836
Long-term obligations under finance leases	240	224
Long-term obligations under operating leases	4,985	4,986
Other liabilities and deferred credits:
Frequent flyer deferred revenue	4,858	5,067
Pension liability	2,478	2,460
Postretirement benefit liability	1,013	994
Other financial liabilities from sale-leasebacks	1,568	1,140
Other	1,298	1,156
Total other liabilities and deferred credits	11,215	10,817
Commitments and contingencies
Stockholders' equity:
Preferred stock	0	0
Common stock	4	4
Additional capital invested	8,923	8,366
Stock held in treasury, at cost	(3,834)	(3,897)
Retained earnings	1,239	2,626
Accumulated other comprehensive loss	(1,126)	(1,139)
Total stockholders' equity	5,206	5,960
Total liabilities and stockholders' equity	61,662	59,548
United Airlines, Inc.
Current assets:
Cash and cash equivalents	12,666	11,269
Short-term investments	309	414
Restricted cash	254	255
Receivables, less allowance for credit losses (2021 — $74; 2020 — $78)	1,389	1,295
Aircraft fuel, spare parts and supplies, less obsolescence allowance (2021 — $502; 2020 — $478)	918	932
Prepaid expenses and other	483	635
Total current assets	16,019	14,800
Operating property and equipment:
Flight equipment	38,851	38,218
Other property and equipment	8,581	8,511
Purchase deposits for flight equipment	1,439	1,166
Total operating property and equipment	48,871	47,895
Less — Accumulated depreciation and amortization	(16,956)	(16,429)
Total operating property and equipment, net	31,915	31,466
Operating lease right-of-use assets	4,516	4,537
Other assets:
Goodwill	4,527	4,527
Intangibles, less accumulated amortization (2021 — $1,507; 2020 — $1,495)	2,840	2,838
Restricted cash	218	218
Deferred income taxes	492	103
Investments in affiliates and other, less allowance for credit losses (2021 — $526; 2020 — $522)	1,107	1,031
Total other assets	9,184	8,717
Total assets	61,634	59,520
Current liabilities:
Accounts payable	1,838	1,595
Accrued salaries and benefits	2,267	1,960
Advance ticket sales	5,502	4,833
Frequent flyer deferred revenue	1,251	908
Current maturities of long-term debt	1,783	1,911
Current maturities of operating leases	623	612
Current maturities of finance leases	179	182
Other	727	728
Total current liabilities	14,170	12,729
Long-term debt	25,849	24,836
Long-term obligations under finance leases	240	224
Long-term obligations under operating leases	4,985	4,986
Other liabilities and deferred credits:
Frequent flyer deferred revenue	4,858	5,067
Pension liability	2,478	2,460
Postretirement benefit liability	1,013	994
Other financial liabilities from sale-leasebacks	1,568	1,140
Other	1,298	1,156
Total other liabilities and deferred credits	11,215	10,817
Commitments and contingencies
Stockholders' equity:
Common stock	0	0
Additional capital invested	117	85
Retained earnings	3,582	4,939
Accumulated other comprehensive loss	(1,126)	(1,139)
Payable to parent	2,602	2,043
Total stockholders' equity	5,175	5,928
Total liabilities and stockholders' equity	$ 61,634	$ 59,520