CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 1,509.0	$ 221.0
Marketable securities	1,294.0	1,300.0
Total cash and marketable securities	2,803.0	1,521.0
Receivables - net	280.0	323.0
Inventories and supplies - net	56.0	72.0
Prepaid expenses and other current assets	105.0	121.0
Total Current Assets	3,244.0	2,037.0
Property and Equipment
Aircraft and other flight equipment	8,257.0	8,549.0
Other property and equipment	1,381.0	1,306.0
Deposits for future flight equipment	591.0	533.0
Property and Equipment Total	10,229.0	10,388.0
Less accumulated depreciation and amortization	3,434.0	3,486.0
Total Property and Equipment - Net	6,795.0	6,902.0
Operating Lease, Right-of-Use Asset	1,568.0	1,711.0
Goodwill	1,943.0	1,943.0
Intangible assets - net	109.0	122.0
Other noncurrent assets	339.0	278.0
Other Assets	3,959.0	4,054.0
Total Assets	13,998.0	12,993.0
Current Liabilities
Accounts payable	102.0	146.0
Accrued wages, vacation and payroll taxes	284.0	470.0
DeferredPSPGrant	361.0	0.0
Other accrued liabilities	327.0	431.0
Deferred revenue, current	555.0	750.0
Operating Lease, Liability, Current	273.0	269.0
Total Current Liabilities	4,120.0	3,201.0
Noncurrent Liabilities
Operating Lease, Liability, Noncurrent	1,376.0	1,439.0
Deferred revenue, noncurrent	1,519.0	1,240.0
Obligation for pension and postretirement medical benefits	581.0	571.0
Other liabilities	373.0	232.0
Other Liabilities and Credits Totals	4,468.0	4,197.0
Commitments and Contingencies
Shareholders' Equity
Preferred stock, $0.01 par value, Authorized: 5,000,000 shares, none issued or outstanding	0.0	0.0
Common stock, $0.01 par value, Authorized: 400,000,000 shares, Issued: 2020 - 132,989,258 shares; 2019 - 131,812,173 shares, Outstanding: 2020 - 123,639,314 shares; 2019 - 123,000,307 shares	1.0	1.0
Capital in excess of par value	350.0	305.0
Treasury stock (common), at cost: 2020 - 9,349,944 shares; 2019 - 8,811,866 shares	(674.0)	(643.0)
Accumulated other comprehensive loss	(458.0)	(465.0)
Retained earnings	4,642.0	5,133.0
Total Shareholders' Equity	3,861.0	4,331.0
Total Liabilities and Shareholders' Equity	13,998.0	12,993.0
Deferred Tax and Other Liabilities, Noncurrent	619.0	715.0
Contract with Customer, Liability, Current	1,131.0	900.0
Long-term Debt and Lease Obligation, Current	1,087.0	235.0
Long-term Debt and Lease Obligation	1,549.0	1,264.0
DeferredPSPGrant	$ 361.0	$ 0.0