CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 470	$ 1,370
Marketable securities	2,646	1,976
Total cash and marketable securities	3,116	3,346
Receivables - net	546	480
Inventories and supplies - net	62	57
Prepaid expenses and other current assets	196	123
Total Current Assets	3,920	4,006
Property and Equipment
Aircraft and other flight equipment	8,127	7,761
Other property and equipment	1,489	1,398
Deposits for future flight equipment	384	583
Property and Equipment	10,000	9,742
Less accumulated depreciation and amortization	3,862	3,531
Total Property and Equipment - Net	6,138	6,211
Other Assets
Operating Lease, Right-of-Use Asset	1,453	1,400
Goodwill and intangible assets	2,044	2,050
Other noncurrent assets	396	379
Total Other Assets	3,893	3,829
Total Assets	13,951	14,046
Current Liabilities
Accounts payable	200	108
Accrued wages, vacation and payroll taxes	457	527
Other accrued liabilities	625	424
Operating Lease, Liability, Current	268	290
Current portion of long-term debt	366	1,138
Total Current Liabilities	3,991	4,293
Long-Term Debt, Net of Current Portion	2,173	2,357
Other Liabilities and Credits
Operating Lease, Liability, Noncurrent	1,279	1,268
Deferred Income Tax Liabilities, Net	578	407
Deferred revenue	1,446	1,544
Obligation for pension and postretirement medical benefits	305	665
Other liabilities	378	524
Total Other Liabilities and Credits	3,986	4,408
Commitments and Contingencies
Shareholders' Equity
Preferred stock, $0.01 par value, Authorized: 5,000,000 shares, none issued or outstanding	0	0
Common stock, $0.01 par value, Authorized: 400,000,000 shares, Issued: 2021 - 135,255,808 shares; 2020 - 133,567,534 shares, Outstanding: 2021 - 125,905,864 shares; 2020 - 124,217,590 shares	1	1
Capital in excess of par value	494	391
Treasury stock (common), at cost: 2021 - 9,349,944 shares; 2020 - 9,349,944 shares	(674)	(674)
Accumulated other comprehensive loss	(262)	(494)
Retained earnings	4,242	3,764
Shareholders' Equity Total	3,801	2,988
Total Liabilities and Shareholders' Equity	$ 13,951	14,046
Common stock, shares authorized	400,000,000
Common stock, par value	$ 0.01
Air Traffic Liability
Current Liabilities
Air traffic liability	$ 1,163	1,073
Mileage Plan Revenue [Member]
Current Liabilities
Air traffic liability	$ 912	$ 733

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).