CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 1,115	$ 281
Marketable securities	1,394	1,510
Total cash and marketable securities	2,509	1,791
Receivables - net	370	383
Inventories and supplies - net	106	116
Prepaid expenses	179	176
Other Assets, Current	212	239
Total Current Assets	3,376	2,705
Property and Equipment
Aircraft and other flight equipment	10,734	10,425
Other property and equipment	1,941	1,814
Deposits for future flight equipment	383	491
Property and Equipment Total	13,058	12,730
Less accumulated depreciation and amortization	4,537	4,342
Total Property and Equipment - Net	8,521	8,388
Operating Lease, Right-of-Use Asset	1,142	1,195
Goodwill	2,033	2,033
Other noncurrent assets	270	292
Other Assets	3,445	3,520
Total Assets	15,342	14,613
Current Liabilities
Accounts payable	203	207
Accrued wages, vacation and payroll taxes	513	584
Other accrued liabilities	852	800
Operating Lease, Liability, Current	153	158
Current portion of long-term debt	359	353
Total Current Liabilities	4,968	4,459
Long-Term Debt, Net of Current Portion	2,313	2,182
Noncurrent Liabilities
Operating Lease, Liability, Noncurrent	1,050	1,125
Deferred Income Tax Liabilities, Net	746	695
Deferred revenue, noncurrent	1,329	1,382
Obligation for pension and postretirement medical benefits	358	362
Other liabilities	352	295
Other Liabilities and Credits Totals	3,835	3,859
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 - 133,792,045 shares; 2020 - 133,567,534 shares, Outstanding: 2021 - 124,442,101 shares; 2020 - 124,217,590 shares	1	1
Capital in excess of par value	$ 757	$ 695
Treasury Stock, Common, Shares	14,094,740	12,870,477
Treasury stock (common), at cost: 2020 - 9,349,944 shares; 2020 - 9,349,944 shares	$ (868)	$ (819)
Accumulated other comprehensive loss	(287)	(299)
Retained earnings	4,623	4,535
Total Shareholders' Equity	4,226	4,113
Total Liabilities and Shareholders' Equity	15,342	14,613
Mileage Plan Revenue [Member]
Current Liabilities
Contract with Customer, Liability, Current	1,312	1,221
Contract with Customer, Liability, Current	1,312	1,221
Passenger Revenue [Member]
Current Liabilities
Contract with Customer, Liability, Current	1,576	1,136
Contract with Customer, Liability, Current	$ 1,576	$ 1,136

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).